Added URLRequestContext to constructor for URLRequest.

net/url_request/url_request_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shlobj.h>
 #endif
@@ skipping 441 matching lines @@
   // request, after redirection.
   // If |include_data| is true, data is uploaded with the request.  The
   // response body is expected to match it exactly, if and only if
   // |request_method| == |redirect_method|.
   void HTTPRedirectMethodTest(const GURL& redirect_url,
                               const std::string& request_method,
                               const std::string& redirect_method,
                               bool include_data) {
     static const char kData[] = "hello world";
     TestDelegate d;
-    URLRequest req(redirect_url, &d);
-    req.set_context(&default_context_);
+    URLRequest req(redirect_url, &d, &default_context_);
     req.set_method(request_method);
     if (include_data) {
       req.set_upload(CreateSimpleUploadData(kData).get());
       HttpRequestHeaders headers;
       headers.SetHeader(HttpRequestHeaders::kContentLength,
                         base::UintToString(arraysize(kData) - 1));
       req.SetExtraRequestHeaders(headers);
     }
     req.Start();
     MessageLoop::current()->Run();
@@ skipping 24 matching lines @@
         ptr--;
         *ptr++ = marker;
         if (++marker > 'z')
           marker = 'a';
       }
     }
     uploadBytes[kMsgSize] = '\0';
 
     for (int i = 0; i < kIterations; ++i) {
       TestDelegate d;
-      URLRequest r(test_server_.GetURL("echo"), &d);
-      r.set_context(&default_context_);
+      URLRequest r(test_server_.GetURL("echo"), &d, &default_context_);
       r.set_method(method.c_str());
 
       r.AppendBytesToUpload(uploadBytes, kMsgSize);
 
       r.Start();
       EXPECT_TRUE(r.is_pending());
 
       MessageLoop::current()->Run();
 
       ASSERT_EQ(1, d.response_started_count()) << "request failed: " <<
@@ skipping 28 matching lines @@
 
     ASSERT_EQ(strlen(expected_data), static_cast<size_t>(d->bytes_received()));
     EXPECT_EQ(0, memcmp(d->data_received().c_str(), expected_data,
                         strlen(expected_data)));
   }
 
   bool DoManyCookiesRequest(int num_cookies){
     TestDelegate d;
     URLRequest r(test_server_.GetURL("set-many-cookies?" +
                                      base::IntToString(num_cookies)),
-                                     &d);
-    r.set_context(&default_context_);
+                                     &d,
+                                     &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     bool is_success = r.status().is_success();
 
     if (!is_success){
       // Requests handled by ChromeFrame send a less precise error message,
@@ skipping 20 matching lines @@
 TEST_F(URLRequestTestHTTP, FLAKY_ProxyTunnelRedirectTest) {
   ASSERT_TRUE(test_server_.Start());
 
   TestNetworkDelegate network_delegate;  // must outlive URLRequest
   TestURLRequestContextWithProxy context(
       test_server_.host_port_pair().ToString(),
       &network_delegate);
 
   TestDelegate d;
   {
-    URLRequest r(GURL("https://www.redirect.com/"), &d);
-    r.set_context(&context);
+    URLRequest r(GURL("https://www.redirect.com/"), &d, &context);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::FAILED, r.status().status());
     EXPECT_EQ(ERR_TUNNEL_CONNECTION_FAILED, r.status().error());
     EXPECT_EQ(1, d.response_started_count());
     // We should not have followed the redirect.
     EXPECT_EQ(0, d.received_redirect_count());
   }
 }
 
 // This is the same as the previous test, but checks that the network delegate
 // registers the error.
 // This test was disabled because it made chrome_frame_net_tests hang
 // (see bug 102991).
 TEST_F(URLRequestTestHTTP, DISABLED_NetworkDelegateTunnelConnectionFailed) {
   ASSERT_TRUE(test_server_.Start());
 
   TestNetworkDelegate network_delegate;  // must outlive URLRequest
   TestURLRequestContextWithProxy context(
       test_server_.host_port_pair().ToString(),
       &network_delegate);
 
   TestDelegate d;
   {
-    URLRequest r(GURL("https://www.redirect.com/"), &d);
-    r.set_context(&context);
+    URLRequest r(GURL("https://www.redirect.com/"), &d, &context);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::FAILED, r.status().status());
     EXPECT_EQ(ERR_TUNNEL_CONNECTION_FAILED, r.status().error());
     EXPECT_EQ(1, d.response_started_count());
     // We should not have followed the redirect.
     EXPECT_EQ(0, d.received_redirect_count());
 
     EXPECT_EQ(1, network_delegate.error_count());
     EXPECT_EQ(ERR_TUNNEL_CONNECTION_FAILED, network_delegate.last_error());
   }
 }
 
 // Tests that the network delegate can block and cancel a request.
 TEST_F(URLRequestTestHTTP, NetworkDelegateCancelRequest) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   BlockingNetworkDelegate network_delegate;
   network_delegate.set_callback_retval(ERR_EMPTY_RESPONSE);
 
   TestURLRequestContextWithProxy context(
       test_server_.host_port_pair().ToString(),
       &network_delegate);
 
   {
-    URLRequest r(test_server_.GetURL(""), &d);
-    r.set_context(&context);
+    URLRequest r(test_server_.GetURL(""), &d, &context);
 
     r.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::FAILED, r.status().status());
     EXPECT_EQ(ERR_EMPTY_RESPONSE, r.status().error());
     EXPECT_EQ(1, network_delegate.created_requests());
     EXPECT_EQ(0, network_delegate.destroyed_requests());
   }
   EXPECT_EQ(1, network_delegate.destroyed_requests());
 }
 
 // Tests that the network delegate can cancel a request synchronously.
 TEST_F(URLRequestTestHTTP, NetworkDelegateCancelRequestSynchronously) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   BlockingNetworkDelegate network_delegate;
   network_delegate.set_retval(ERR_EMPTY_RESPONSE);
 
   TestURLRequestContextWithProxy context(
       test_server_.host_port_pair().ToString(),
       &network_delegate);
 
   {
-    URLRequest r(test_server_.GetURL(""), &d);
-    r.set_context(&context);
+    URLRequest r(test_server_.GetURL(""), &d, &context);
 
     r.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::FAILED, r.status().status());
     EXPECT_EQ(ERR_EMPTY_RESPONSE, r.status().error());
     EXPECT_EQ(1, network_delegate.created_requests());
     EXPECT_EQ(0, network_delegate.destroyed_requests());
   }
   EXPECT_EQ(1, network_delegate.destroyed_requests());
 }
 
 // Tests that the network delegate can block and redirect a request to a new
 // URL.
 TEST_F(URLRequestTestHTTP, NetworkDelegateRedirectRequest) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   BlockingNetworkDelegate network_delegate;
   GURL redirect_url(test_server_.GetURL("simple.html"));
   network_delegate.set_redirect_url(redirect_url);
 
   TestURLRequestContextWithProxy context(
       test_server_.host_port_pair().ToString(),
       &network_delegate);
 
   {
     GURL original_url(test_server_.GetURL("empty.html"));
-    URLRequest r(original_url, &d);
-    r.set_context(&context);
+    URLRequest r(original_url, &d, &context);
 
     r.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::SUCCESS, r.status().status());
     EXPECT_EQ(0, r.status().error());
     EXPECT_EQ(redirect_url, r.url());
     EXPECT_EQ(original_url, r.original_url());
     EXPECT_EQ(2U, r.url_chain().size());
     EXPECT_EQ(1, network_delegate.created_requests());
@@ skipping 12 matching lines @@
   GURL redirect_url(test_server_.GetURL("simple.html"));
   network_delegate.set_redirect_url(redirect_url);
   network_delegate.set_retval(OK);
 
   TestURLRequestContextWithProxy context(
       test_server_.host_port_pair().ToString(),
       &network_delegate);
 
   {
     GURL original_url(test_server_.GetURL("empty.html"));
-    URLRequest r(original_url, &d);
-    r.set_context(&context);
+    URLRequest r(original_url, &d, &context);
 
     r.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::SUCCESS, r.status().status());
     EXPECT_EQ(0, r.status().error());
     EXPECT_EQ(redirect_url, r.url());
     EXPECT_EQ(original_url, r.original_url());
     EXPECT_EQ(2U, r.url_chain().size());
     EXPECT_EQ(1, network_delegate.created_requests());
@@ skipping 12 matching lines @@
   BlockingNetworkDelegate network_delegate;
   GURL redirect_url(test_server_.GetURL("echo"));
   network_delegate.set_redirect_url(redirect_url);
 
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
 
   {
     GURL original_url(test_server_.GetURL("empty.html"));
-    URLRequest r(original_url, &d);
-    r.set_context(&context);
+    URLRequest r(original_url, &d, &context);
     r.set_method("POST");
     r.set_upload(CreateSimpleUploadData(kData).get());
     HttpRequestHeaders headers;
     headers.SetHeader(HttpRequestHeaders::kContentLength,
                       base::UintToString(arraysize(kData) - 1));
     r.SetExtraRequestHeaders(headers);
     r.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::SUCCESS, r.status().status());
@@ skipping 22 matching lines @@
       NetworkDelegate::AUTH_REQUIRED_RESPONSE_NO_ACTION);
 
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
 
   d.set_credentials(AuthCredentials(kUser, kSecret));
 
   {
     GURL url(test_server_.GetURL("auth-basic"));
-    URLRequest r(url, &d);
-    r.set_context(&context);
+    URLRequest r(url, &d, &context);
     r.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::SUCCESS, r.status().status());
     EXPECT_EQ(0, r.status().error());
     EXPECT_EQ(200, r.GetResponseCode());
     EXPECT_TRUE(d.auth_required_called());
     EXPECT_EQ(1, network_delegate.created_requests());
     EXPECT_EQ(0, network_delegate.destroyed_requests());
   }
@@ skipping 11 matching lines @@
       NetworkDelegate::AUTH_REQUIRED_RESPONSE_SET_AUTH);
 
   network_delegate.set_auth_credentials(AuthCredentials(kUser, kSecret));
 
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
 
   {
     GURL url(test_server_.GetURL("auth-basic"));
-    URLRequest r(url, &d);
-    r.set_context(&context);
+    URLRequest r(url, &d, &context);
     r.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::SUCCESS, r.status().status());
     EXPECT_EQ(0, r.status().error());
     EXPECT_EQ(200, r.GetResponseCode());
     EXPECT_FALSE(d.auth_required_called());
     EXPECT_EQ(1, network_delegate.created_requests());
     EXPECT_EQ(0, network_delegate.destroyed_requests());
   }
   EXPECT_EQ(1, network_delegate.destroyed_requests());
 }
 
 // Tests that the network delegate can synchronously complete OnAuthRequired
 // by cancelling authentication.
 TEST_F(URLRequestTestHTTP, NetworkDelegateOnAuthRequiredSyncCancel) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   BlockingNetworkDelegate network_delegate;
   network_delegate.set_auth_retval(
       NetworkDelegate::AUTH_REQUIRED_RESPONSE_CANCEL_AUTH);
 
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
 
   {
     GURL url(test_server_.GetURL("auth-basic"));
-    URLRequest r(url, &d);
-    r.set_context(&context);
+    URLRequest r(url, &d, &context);
     r.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::SUCCESS, r.status().status());
     EXPECT_EQ(OK, r.status().error());
     EXPECT_EQ(401, r.GetResponseCode());
     EXPECT_FALSE(d.auth_required_called());
     EXPECT_EQ(1, network_delegate.created_requests());
     EXPECT_EQ(0, network_delegate.destroyed_requests());
   }
@@ skipping 15 matching lines @@
       NetworkDelegate::AUTH_REQUIRED_RESPONSE_NO_ACTION);
 
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
 
   d.set_credentials(AuthCredentials(kUser, kSecret));
 
   {
     GURL url(test_server_.GetURL("auth-basic"));
-    URLRequest r(url, &d);
-    r.set_context(&context);
+    URLRequest r(url, &d, &context);
     r.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::SUCCESS, r.status().status());
     EXPECT_EQ(0, r.status().error());
     EXPECT_EQ(200, r.GetResponseCode());
     EXPECT_TRUE(d.auth_required_called());
     EXPECT_EQ(1, network_delegate.created_requests());
     EXPECT_EQ(0, network_delegate.destroyed_requests());
   }
@@ skipping 14 matching lines @@
 
   AuthCredentials auth_credentials(kUser, kSecret);
   network_delegate.set_auth_credentials(auth_credentials);
 
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
 
   {
     GURL url(test_server_.GetURL("auth-basic"));
-    URLRequest r(url, &d);
-    r.set_context(&context);
+    URLRequest r(url, &d, &context);
     r.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::SUCCESS, r.status().status());
     EXPECT_EQ(0, r.status().error());
 
     EXPECT_EQ(200, r.GetResponseCode());
     EXPECT_FALSE(d.auth_required_called());
     EXPECT_EQ(1, network_delegate.created_requests());
     EXPECT_EQ(0, network_delegate.destroyed_requests());
@@ skipping 12 matching lines @@
       NetworkDelegate::AUTH_REQUIRED_RESPONSE_IO_PENDING);
   network_delegate.set_auth_callback_retval(
       NetworkDelegate::AUTH_REQUIRED_RESPONSE_CANCEL_AUTH);
 
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
 
   {
     GURL url(test_server_.GetURL("auth-basic"));
-    URLRequest r(url, &d);
-    r.set_context(&context);
+    URLRequest r(url, &d, &context);
     r.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::SUCCESS, r.status().status());
     EXPECT_EQ(OK, r.status().error());
     EXPECT_EQ(401, r.GetResponseCode());
     EXPECT_FALSE(d.auth_required_called());
     EXPECT_EQ(1, network_delegate.created_requests());
     EXPECT_EQ(0, network_delegate.destroyed_requests());
   }
   EXPECT_EQ(1, network_delegate.destroyed_requests());
 }
 
 // Tests that we can handle when a network request was canceled while we were
 // waiting for the network delegate.
 // Part 1: Request is cancelled while waiting for OnBeforeURLRequest callback.
 TEST_F(URLRequestTestHTTP, NetworkDelegateCancelWhileWaiting1) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   BlockingNetworkDelegateWithManualCallback network_delegate;
   network_delegate.BlockOn(
       BlockingNetworkDelegateWithManualCallback::ON_BEFORE_URL_REQUEST);
 
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
 
   {
-    URLRequest r(test_server_.GetURL(""), &d);
-    r.set_context(&context);
+    URLRequest r(test_server_.GetURL(""), &d, &context);
 
     r.Start();
     network_delegate.WaitForState(
         BlockingNetworkDelegateWithManualCallback::ON_BEFORE_URL_REQUEST);
     EXPECT_EQ(0, network_delegate.completed_requests());
     // Cancel before callback.
     r.Cancel();
     // Ensure that network delegate is notified.
     EXPECT_EQ(1, network_delegate.completed_requests());
     EXPECT_EQ(URLRequestStatus::CANCELED, r.status().status());
@@ skipping 13 matching lines @@
   TestDelegate d;
   BlockingNetworkDelegateWithManualCallback network_delegate;
   network_delegate.BlockOn(
       BlockingNetworkDelegateWithManualCallback::ON_BEFORE_SEND_HEADERS);
 
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
 
   {
-    URLRequest r(test_server_.GetURL(""), &d);
-    r.set_context(&context);
+    URLRequest r(test_server_.GetURL(""), &d, &context);
 
     r.Start();
     network_delegate.WaitForState(
         BlockingNetworkDelegateWithManualCallback::ON_BEFORE_SEND_HEADERS);
     EXPECT_EQ(0, network_delegate.completed_requests());
     // Cancel before callback.
     r.Cancel();
     // Ensure that network delegate is notified.
     EXPECT_EQ(1, network_delegate.completed_requests());
     EXPECT_EQ(URLRequestStatus::CANCELED, r.status().status());
@@ skipping 13 matching lines @@
   TestDelegate d;
   BlockingNetworkDelegateWithManualCallback network_delegate;
   network_delegate.BlockOn(
       BlockingNetworkDelegateWithManualCallback::ON_HEADERS_RECEIVED);
 
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
 
   {
-    URLRequest r(test_server_.GetURL(""), &d);
-    r.set_context(&context);
+    URLRequest r(test_server_.GetURL(""), &d, &context);
 
     r.Start();
     network_delegate.WaitForState(
         BlockingNetworkDelegateWithManualCallback::ON_HEADERS_RECEIVED);
     EXPECT_EQ(0, network_delegate.completed_requests());
     // Cancel before callback.
     r.Cancel();
     // Ensure that network delegate is notified.
     EXPECT_EQ(1, network_delegate.completed_requests());
     EXPECT_EQ(URLRequestStatus::CANCELED, r.status().status());
@@ skipping 13 matching lines @@
   TestDelegate d;
   BlockingNetworkDelegateWithManualCallback network_delegate;
   network_delegate.BlockOn(
       BlockingNetworkDelegateWithManualCallback::ON_AUTH_REQUIRED);
 
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
 
   {
-    URLRequest r(test_server_.GetURL("auth-basic"), &d);
-    r.set_context(&context);
+    URLRequest r(test_server_.GetURL("auth-basic"), &d, &context);
 
     r.Start();
     network_delegate.WaitForState(
         BlockingNetworkDelegateWithManualCallback::ON_AUTH_REQUIRED);
     EXPECT_EQ(0, network_delegate.completed_requests());
     // Cancel before callback.
     r.Cancel();
     // Ensure that network delegate is notified.
     EXPECT_EQ(1, network_delegate.completed_requests());
     EXPECT_EQ(URLRequestStatus::CANCELED, r.status().status());
@@ skipping 10 matching lines @@
 TEST_F(URLRequestTestHTTP, UnexpectedServerAuthTest) {
   ASSERT_TRUE(test_server_.Start());
 
   TestNetworkDelegate network_delegate;  // must outlive URLRequest
   TestURLRequestContextWithProxy context(
       test_server_.host_port_pair().ToString(),
       &network_delegate);
 
   TestDelegate d;
   {
-    URLRequest r(GURL("https://www.server-auth.com/"), &d);
-    r.set_context(&context);
+    URLRequest r(GURL("https://www.server-auth.com/"), &d, &context);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::FAILED, r.status().status());
     EXPECT_EQ(ERR_TUNNEL_CONNECTION_FAILED, r.status().error());
   }
 }
 
 TEST_F(URLRequestTestHTTP, GetTest_NoCache) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
-    URLRequest r(test_server_.GetURL(""), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL(""), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.response_started_count());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_NE(0, d.bytes_received());
     EXPECT_EQ(test_server_.host_port_pair().host(),
@@ skipping 39 matching lines @@
       upper_bound = num_cookies;
   }
   // Success: the test did not crash.
 }
 
 TEST_F(URLRequestTestHTTP, GetTest) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
-    URLRequest r(test_server_.GetURL(""), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL(""), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.response_started_count());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_NE(0, d.bytes_received());
     EXPECT_EQ(test_server_.host_port_pair().host(),
@@ skipping 25 matching lines @@
     {
       std::string test_file =
           base::StringPrintf("compressedfiles/BullRunSpeech.txt?%c",
                              test_parameters[i]);
 
       TestNetworkDelegate network_delegate;  // must outlive URLRequest
       TestURLRequestContext context(true);
       context.set_network_delegate(&network_delegate);
       context.Init();
 
-      URLRequest r(test_server_.GetURL(test_file), &d);
-      r.set_context(&context);
+      URLRequest r(test_server_.GetURL(test_file), &d, &context);
       r.Start();
       EXPECT_TRUE(r.is_pending());
 
       MessageLoop::current()->Run();
 
       EXPECT_EQ(1, d.response_started_count());
       EXPECT_FALSE(d.received_data_before_response());
       VLOG(1) << " Received " << d.bytes_received() << " bytes"
               << " status = " << r.status().status()
               << " error = " << r.status().error();
@@ skipping 18 matching lines @@
                                TestServer::kLocalhost,
                                FilePath(FILE_PATH_LITERAL("net/data/ssl")));
   ASSERT_TRUE(https_test_server.Start());
 
   // An https server is sent a request with an https referer,
   // and responds with a redirect to an http url. The http
   // server should not be sent the referer.
   GURL http_destination = test_server_.GetURL("");
   TestDelegate d;
   URLRequest req(https_test_server.GetURL(
-      "server-redirect?" + http_destination.spec()), &d);
-  req.set_context(&default_context_);
+      "server-redirect?" + http_destination.spec()), &d, &default_context_);
   req.set_referrer("https://www.referrer.com/");
   req.Start();
   MessageLoop::current()->Run();
 
   EXPECT_EQ(1, d.response_started_count());
   EXPECT_EQ(1, d.received_redirect_count());
   EXPECT_EQ(http_destination, req.url());
   EXPECT_EQ(std::string(), req.referrer());
 }
 
 TEST_F(URLRequestTestHTTP, MultipleRedirectTest) {
   ASSERT_TRUE(test_server_.Start());
 
   GURL destination_url = test_server_.GetURL("");
   GURL middle_redirect_url = test_server_.GetURL(
       "server-redirect?" + destination_url.spec());
   GURL original_url = test_server_.GetURL(
       "server-redirect?" + middle_redirect_url.spec());
   TestDelegate d;
-  URLRequest req(original_url, &d);
-  req.set_context(&default_context_);
+  URLRequest req(original_url, &d, &default_context_);
   req.Start();
   MessageLoop::current()->Run();
 
   EXPECT_EQ(1, d.response_started_count());
   EXPECT_EQ(2, d.received_redirect_count());
   EXPECT_EQ(destination_url, req.url());
   EXPECT_EQ(original_url, req.original_url());
   ASSERT_EQ(3U, req.url_chain().size());
   EXPECT_EQ(original_url, req.url_chain()[0]);
   EXPECT_EQ(middle_redirect_url, req.url_chain()[1]);
@@ skipping 16 matching lines @@
 // This test was disabled because it made chrome_frame_net_tests hang
 // (see bug 102991).
 TEST_F(HTTPSRequestTest, DISABLED_HTTPSGetTest) {
   TestServer test_server(TestServer::TYPE_HTTPS,
                          TestServer::kLocalhost,
                          FilePath(FILE_PATH_LITERAL("net/data/ssl")));
   ASSERT_TRUE(test_server.Start());
 
   TestDelegate d;
   {
-    URLRequest r(test_server.GetURL(""), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server.GetURL(""), &d, &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.response_started_count());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_NE(0, d.bytes_received());
     CheckSSLInfo(r.ssl_info());
     EXPECT_EQ(test_server.host_port_pair().host(),
               r.GetSocketAddress().host());
     EXPECT_EQ(test_server.host_port_pair().port(),
               r.GetSocketAddress().port());
   }
 }
 
 TEST_F(HTTPSRequestTest, HTTPSMismatchedTest) {
   TestServer::HTTPSOptions https_options(
       TestServer::HTTPSOptions::CERT_MISMATCHED_NAME);
   TestServer test_server(https_options,
                          FilePath(FILE_PATH_LITERAL("net/data/ssl")));
   ASSERT_TRUE(test_server.Start());
 
   bool err_allowed = true;
   for (int i = 0; i < 2 ; i++, err_allowed = !err_allowed) {
     TestDelegate d;
     {
       d.set_allow_certificate_errors(err_allowed);
-      URLRequest r(test_server.GetURL(""), &d);
-      r.set_context(&default_context_);
+      URLRequest r(test_server.GetURL(""), &d, &default_context_);
 
       r.Start();
       EXPECT_TRUE(r.is_pending());
 
       MessageLoop::current()->Run();
 
       EXPECT_EQ(1, d.response_started_count());
       EXPECT_FALSE(d.received_data_before_response());
       EXPECT_TRUE(d.have_certificate_errors());
       if (err_allowed) {
@@ skipping 13 matching lines @@
                          FilePath(FILE_PATH_LITERAL("net/data/ssl")));
   ASSERT_TRUE(test_server.Start());
 
   // Iterate from false to true, just so that we do the opposite of the
   // previous test in order to increase test coverage.
   bool err_allowed = false;
   for (int i = 0; i < 2 ; i++, err_allowed = !err_allowed) {
     TestDelegate d;
     {
       d.set_allow_certificate_errors(err_allowed);
-      URLRequest r(test_server.GetURL(""), &d);
-      r.set_context(&default_context_);
+      URLRequest r(test_server.GetURL(""), &d, &default_context_);
 
       r.Start();
       EXPECT_TRUE(r.is_pending());
 
       MessageLoop::current()->Run();
 
       EXPECT_EQ(1, d.response_started_count());
       EXPECT_FALSE(d.received_data_before_response());
       EXPECT_TRUE(d.have_certificate_errors());
       if (err_allowed) {
@@ skipping 63 matching lines @@
   }
 
   void DoConnection(const TestServer::HTTPSOptions& https_options,
                     CertStatus* out_cert_status) {
     TestServer test_server(https_options,
                            FilePath(FILE_PATH_LITERAL("net/data/ssl")));
     ASSERT_TRUE(test_server.Start());
 
     TestDelegate d;
     d.set_allow_certificate_errors(true);
-    URLRequest r(test_server.GetURL(""), &d);
-    r.set_context(&context_);
+    URLRequest r(test_server.GetURL(""), &d, &context_);
     r.Start();
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.response_started_count());
     *out_cert_status = r.ssl_info().cert_status;
   }
 
   ~HTTPSOCSPTest() {
 #if defined(USE_NSS)
@@ skipping 245 matching lines @@
       TestServer::HTTPSOptions::CERT_OK);
   https_options.tls_intolerant = TestServer::HTTPSOptions::TLS_INTOLERANT_ALL;
   TestServer test_server(https_options,
                          FilePath(FILE_PATH_LITERAL("net/data/ssl")));
   ASSERT_TRUE(test_server.Start());
 
   TestDelegate d;
   TestURLRequestContext context(true);
   context.Init();
   d.set_allow_certificate_errors(true);
-  URLRequest r(test_server.GetURL(""), &d);
-  r.set_context(&context);
+  URLRequest r(test_server.GetURL(""), &d, &context);
   r.Start();
 
   MessageLoop::current()->Run();
 
   EXPECT_EQ(1, d.response_started_count());
   EXPECT_NE(0, d.bytes_received());
   EXPECT_EQ(static_cast<int>(SSL_CONNECTION_VERSION_SSL3),
             SSLConnectionStatusToVersion(r.ssl_info().connection_status));
   EXPECT_TRUE(r.ssl_info().connection_status & SSL_CONNECTION_VERSION_FALLBACK);
 }
@@ skipping 14 matching lines @@
   https_options.tls_intolerant =
       TestServer::HTTPSOptions::TLS_INTOLERANT_TLS1_1;
   TestServer test_server(https_options,
                          FilePath(FILE_PATH_LITERAL("net/data/ssl")));
   ASSERT_TRUE(test_server.Start());
 
   TestDelegate d;
   TestURLRequestContext context(true);
   context.Init();
   d.set_allow_certificate_errors(true);
-  URLRequest r(test_server.GetURL(""), &d);
-  r.set_context(&context);
+  URLRequest r(test_server.GetURL(""), &d, &context);
   r.Start();
 
   MessageLoop::current()->Run();
 
   EXPECT_EQ(1, d.response_started_count());
   EXPECT_NE(0, d.bytes_received());
   EXPECT_EQ(static_cast<int>(SSL_CONNECTION_VERSION_TLS1),
             SSLConnectionStatusToVersion(r.ssl_info().connection_status));
   EXPECT_TRUE(r.ssl_info().connection_status & SSL_CONNECTION_VERSION_FALLBACK);
 }
@@ skipping 18 matching lines @@
   TestNetworkDelegate network_delegate;  // must outlive URLRequest
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.set_host_resolver(&host_resolver);
   TransportSecurityState transport_security_state;
   context.set_transport_security_state(&transport_security_state);
   context.Init();
 
   TestDelegate d;
   URLRequest r(GURL(StringPrintf("https://www.google.com:%d",
-                                     test_server.host_port_pair().port())),
-                   &d);
-  r.set_context(&context);
+                                 test_server.host_port_pair().port())),
+               &d,
+               &context);
 
   r.Start();
   EXPECT_TRUE(r.is_pending());
 
   MessageLoop::current()->Run();
 
   EXPECT_EQ(1, d.response_started_count());
   EXPECT_FALSE(d.received_data_before_response());
   EXPECT_TRUE(d.have_certificate_errors());
   EXPECT_TRUE(d.certificate_errors_are_fatal());
@@ skipping 23 matching lines @@
   context.set_host_resolver(&host_resolver);
   TransportSecurityState transport_security_state;
   TransportSecurityState::DomainState domain_state;
   EXPECT_TRUE(transport_security_state.GetDomainState("www.google.com", true,
                                                       &domain_state));
   context.set_transport_security_state(&transport_security_state);
   context.Init();
 
   TestDelegate d;
   URLRequest r(GURL(StringPrintf("https://www.google.com:%d",
-                                     test_server.host_port_pair().port())),
-                   &d);
-  r.set_context(&context);
+                                 test_server.host_port_pair().port())),
+               &d,
+               &context);
 
   r.Start();
   EXPECT_TRUE(r.is_pending());
 
   MessageLoop::current()->Run();
 
   EXPECT_EQ(1, d.response_started_count());
   EXPECT_FALSE(d.received_data_before_response());
   EXPECT_TRUE(d.have_certificate_errors());
   EXPECT_TRUE(d.certificate_errors_are_fatal());
@@ skipping 41 matching lines @@
 //   HTTP request.
 TEST_F(HTTPSRequestTest, ClientAuthTest) {
   TestServer::HTTPSOptions https_options;
   https_options.request_client_certificate = true;
   TestServer test_server(https_options,
                          FilePath(FILE_PATH_LITERAL("net/data/ssl")));
   ASSERT_TRUE(test_server.Start());
 
   SSLClientAuthTestDelegate d;
   {
-    URLRequest r(test_server.GetURL(""), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server.GetURL(""), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.on_certificate_requested_count());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_EQ(0, d.bytes_received());
 
@@ skipping 16 matching lines @@
   TestServer::HTTPSOptions https_options;
   https_options.record_resume = true;
   TestServer test_server(https_options,
                          FilePath(FILE_PATH_LITERAL("net/data/ssl")));
   ASSERT_TRUE(test_server.Start());
 
   SSLClientSocket::ClearSessionCache();
 
   {
     TestDelegate d;
-    URLRequest r(test_server.GetURL("ssl-session-cache"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(
+        test_server.GetURL("ssl-session-cache"), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.response_started_count());
   }
 
   reinterpret_cast<HttpCache*>(default_context_.http_transaction_factory())->
     CloseAllConnections();
 
   {
     TestDelegate d;
-    URLRequest r(test_server.GetURL("ssl-session-cache"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(
+        test_server.GetURL("ssl-session-cache"), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     // The response will look like;
     //   insert abc
     //   lookup abc
     //   insert xyz
@@ skipping 29 matching lines @@
   TestServer::HTTPSOptions https_options;
   https_options.record_resume = true;
   TestServer test_server(https_options,
                          FilePath(FILE_PATH_LITERAL("net/data/ssl")));
   ASSERT_TRUE(test_server.Start());
 
   SSLClientSocket::ClearSessionCache();
 
   {
     TestDelegate d;
-    URLRequest r(test_server.GetURL("ssl-session-cache"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(
+        test_server.GetURL("ssl-session-cache"), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.response_started_count());
   }
 
   // Now create a new HttpCache with a different ssl_session_cache_shard value.
   HttpNetworkSession::Params params;
   params.host_resolver = default_context_.host_resolver();
   params.cert_verifier = default_context_.cert_verifier();
   params.proxy_service = default_context_.proxy_service();
   params.ssl_config_service = default_context_.ssl_config_service();
   params.http_auth_handler_factory =
       default_context_.http_auth_handler_factory();
   params.network_delegate = default_context_.network_delegate();
   params.http_server_properties = default_context_.http_server_properties();
   params.ssl_session_cache_shard = "alternate";
 
   scoped_ptr<net::HttpCache> cache(new net::HttpCache(
       new net::HttpNetworkSession(params),
       net::HttpCache::DefaultBackend::InMemory(0)));
 
   default_context_.set_http_transaction_factory(cache.get());
 
   {
     TestDelegate d;
-    URLRequest r(test_server.GetURL("ssl-session-cache"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(
+        test_server.GetURL("ssl-session-cache"), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     // The response will look like;
     //   insert abc
     //   insert xyz
     //
@@ skipping 16 matching lines @@
       } else {
         EXPECT_NE(session_id, parts[1]);
       }
     }
   }
 }
 
 TEST_F(URLRequestTestHTTP, CancelTest) {
   TestDelegate d;
   {
-    URLRequest r(GURL("http://www.google.com/"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(GURL("http://www.google.com/"), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     r.Cancel();
 
     MessageLoop::current()->Run();
 
     // We expect to receive OnResponseStarted even though the request has been
     // cancelled.
     EXPECT_EQ(1, d.response_started_count());
     EXPECT_EQ(0, d.bytes_received());
     EXPECT_FALSE(d.received_data_before_response());
   }
 }
 
 TEST_F(URLRequestTestHTTP, CancelTest2) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
-    URLRequest r(test_server_.GetURL(""), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL(""), &d, &default_context_);
 
     d.set_cancel_in_response_started(true);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.response_started_count());
     EXPECT_EQ(0, d.bytes_received());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_EQ(URLRequestStatus::CANCELED, r.status().status());
   }
 }
 
 TEST_F(URLRequestTestHTTP, CancelTest3) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
-    URLRequest r(test_server_.GetURL(""), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL(""), &d, &default_context_);
 
     d.set_cancel_in_received_data(true);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.response_started_count());
     // There is no guarantee about how much data was received
     // before the cancel was issued.  It could have been 0 bytes,
     // or it could have been all the bytes.
     // EXPECT_EQ(0, d.bytes_received());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_EQ(URLRequestStatus::CANCELED, r.status().status());
   }
 }
 
 TEST_F(URLRequestTestHTTP, CancelTest4) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
-    URLRequest r(test_server_.GetURL(""), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL(""), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     // The request will be implicitly canceled when it is destroyed. The
     // test delegate must not post a quit message when this happens because
     // this test doesn't actually have a message loop. The quit message would
     // get put on this thread's message queue and the next test would exit
     // early, causing problems.
     d.set_quit_on_complete(false);
   }
   // expect things to just cleanup properly.
 
   // we won't actually get a received reponse here because we've never run the
   // message loop
   EXPECT_FALSE(d.received_data_before_response());
   EXPECT_EQ(0, d.bytes_received());
 }
 
 TEST_F(URLRequestTestHTTP, CancelTest5) {
   ASSERT_TRUE(test_server_.Start());
 
   // populate cache
   {
     TestDelegate d;
-    URLRequest r(test_server_.GetURL("cachetime"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("cachetime"), &d, &default_context_);
     r.Start();
     MessageLoop::current()->Run();
     EXPECT_EQ(URLRequestStatus::SUCCESS, r.status().status());
   }
 
   // cancel read from cache (see bug 990242)
   {
     TestDelegate d;
-    URLRequest r(test_server_.GetURL("cachetime"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("cachetime"), &d, &default_context_);
     r.Start();
     r.Cancel();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(URLRequestStatus::CANCELED, r.status().status());
     EXPECT_EQ(1, d.response_started_count());
     EXPECT_EQ(0, d.bytes_received());
     EXPECT_FALSE(d.received_data_before_response());
   }
 }
 
 TEST_F(URLRequestTestHTTP, PostTest) {
   ASSERT_TRUE(test_server_.Start());
   HTTPUploadDataOperationTest("POST");
 }
 
 TEST_F(URLRequestTestHTTP, PutTest) {
   ASSERT_TRUE(test_server_.Start());
   HTTPUploadDataOperationTest("PUT");
 }
 
 TEST_F(URLRequestTestHTTP, PostEmptyTest) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
-    URLRequest r(test_server_.GetURL("echo"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("echo"), &d, &default_context_);
     r.set_method("POST");
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     ASSERT_EQ(1, d.response_started_count()) << "request failed: " <<
         (int) r.status().status() << ", error: " << r.status().error();
 
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_TRUE(d.data_received().empty());
   }
 }
 
 TEST_F(URLRequestTestHTTP, PostFileTest) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
-    URLRequest r(test_server_.GetURL("echo"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("echo"), &d, &default_context_);
     r.set_method("POST");
 
     FilePath dir;
     PathService::Get(base::DIR_EXE, &dir);
     file_util::SetCurrentDirectory(dir);
 
     scoped_refptr<UploadData> upload_data(new UploadData);
 
     FilePath path;
     PathService::Get(base::DIR_SOURCE_ROOT, &path);
@@ skipping 32 matching lines @@
     ASSERT_EQ(size, d.bytes_received());
     EXPECT_EQ(0, memcmp(d.data_received().c_str(), buf.get(), size));
   }
 }
 
 TEST_F(URLRequestTestHTTP, TestPostChunkedDataBeforeStart) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
-    URLRequest r(test_server_.GetURL("echo"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("echo"), &d, &default_context_);
     r.EnableChunkedUpload();
     r.set_method("POST");
     AddChunksToUpload(&r);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     VerifyReceivedDataMatchesChunks(&r, &d);
   }
 }
 
 TEST_F(URLRequestTestHTTP, TestPostChunkedDataAfterStart) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
-    URLRequest r(test_server_.GetURL("echo"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("echo"), &d, &default_context_);
     r.EnableChunkedUpload();
     r.set_method("POST");
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->RunAllPending();
     AddChunksToUpload(&r);
     MessageLoop::current()->Run();
 
     VerifyReceivedDataMatchesChunks(&r, &d);
   }
 }
 
 TEST_F(URLRequestTest, AboutBlankTest) {
   TestDelegate d;
   {
-    URLRequest r(GURL("about:blank"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(GURL("about:blank"), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(!r.is_pending());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_EQ(d.bytes_received(), 0);
     EXPECT_EQ("", r.GetSocketAddress().host());
@@ skipping 18 matching lines @@
         "GFZnNOXczThvpKIzjcahSqIzkvDLayDq6D3eOjtBbNUEIZYyqsvj4V4wY92eNJ4IoyhTb"
         "xXX1T5xsV9tm9r4TQwHLiZw/pdDZJea8TKmsmR/K0uLh/GwnCHghTja6lPhphezPfO5/5"
         "MrVvMzNaI3+ERHfrFzPKQukrQGI4d/3EFD/3E2mVNYvi4at7CXWREaxZGD+3hg28zD3gV"
         "Md6q5c8GdosynKmSeRuGzpjyl1/9UDGtPR5HeaKT8Wjo17WXk579BXVUhN64ehF9fhRtq"
         "/uxxZKzNiZFGD0wRC3NFROZ5mwIPL/96K/rKMMLrIzF9uhHr+/sYH7DAbwlgC4J+R2Z7F"
         "Ux1qLnV7MGF40smVSoJ/jvHRfYhQeUJd/SnYtGWhPHR0Sz+GE2F2yth0B36Vcz2KpnufB"
         "JbsysjjW4kblBUiIjiURUWqJY65zxbnTy57GQyH58zgy0QBtTQv5gH15XMdKkYu+TGaJM"
         "nlm2O34uI4b9tflqp1+QEFGzoW/ulmcofcpkZCYJhDfSpme7QcrHa+Xfji8paEQkTkSfm"
         "moRWRNZr/F1KfVMjW+IKEnv2FwZfKdzt0BQR6lClcZR0EfEXEfv/G6W9iLiIyCoReV5En"
         "hORIBHx+ufPj/gLB/zGI/G4Bk0AAAAASUVORK5CYII="),
-        &d);
-    r.set_context(&default_context_);
+        &d,
+        &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(!r.is_pending());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_EQ(d.bytes_received(), 911);
     EXPECT_EQ("", r.GetSocketAddress().host());
     EXPECT_EQ(0, r.GetSocketAddress().port());
   }
 }
 
 TEST_F(URLRequestTest, FileTest) {
   FilePath app_path;
   PathService::Get(base::FILE_EXE, &app_path);
   GURL app_url = FilePathToFileURL(app_path);
 
   TestDelegate d;
   {
-    URLRequest r(app_url, &d);
-    r.set_context(&default_context_);
+    URLRequest r(app_url, &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     int64 file_size = -1;
     EXPECT_TRUE(file_util::GetFileSize(app_path, &file_size));
 
     EXPECT_TRUE(!r.is_pending());
@@ skipping 19 matching lines @@
   EXPECT_TRUE(file_util::GetFileSize(temp_path, &file_size));
 
   const size_t first_byte_position = 500;
   const size_t last_byte_position = buffer_size - first_byte_position;
   const size_t content_length = last_byte_position - first_byte_position + 1;
   std::string partial_buffer_string(buffer.get() + first_byte_position,
                                     buffer.get() + last_byte_position + 1);
 
   TestDelegate d;
   {
-    URLRequest r(temp_url, &d);
-    r.set_context(&default_context_);
+    URLRequest r(temp_url, &d, &default_context_);
 
     HttpRequestHeaders headers;
     headers.SetHeader(HttpRequestHeaders::kRange,
                       base::StringPrintf(
                            "bytes=%" PRIuS "-%" PRIuS,
                            first_byte_position, last_byte_position));
     r.SetExtraRequestHeaders(headers);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
@@ skipping 23 matching lines @@
   EXPECT_TRUE(file_util::GetFileSize(temp_path, &file_size));
 
   const size_t first_byte_position = 500;
   const size_t last_byte_position = buffer_size - 1;
   const size_t content_length = last_byte_position - first_byte_position + 1;
   std::string partial_buffer_string(buffer.get() + first_byte_position,
                                     buffer.get() + last_byte_position + 1);
 
   TestDelegate d;
   {
-    URLRequest r(temp_url, &d);
-    r.set_context(&default_context_);
+    URLRequest r(temp_url, &d, &default_context_);
 
     HttpRequestHeaders headers;
     headers.SetHeader(HttpRequestHeaders::kRange,
                       base::StringPrintf("bytes=%" PRIuS "-",
                                          first_byte_position));
     r.SetExtraRequestHeaders(headers);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
@@ skipping 16 matching lines @@
   FilePath temp_path;
   EXPECT_TRUE(file_util::CreateTemporaryFile(&temp_path));
   GURL temp_url = FilePathToFileURL(temp_path);
   EXPECT_TRUE(file_util::WriteFile(temp_path, buffer.get(), buffer_size));
 
   int64 file_size;
   EXPECT_TRUE(file_util::GetFileSize(temp_path, &file_size));
 
   TestDelegate d;
   {
-    URLRequest r(temp_url, &d);
-    r.set_context(&default_context_);
+    URLRequest r(temp_url, &d, &default_context_);
 
     HttpRequestHeaders headers;
     headers.SetHeader(HttpRequestHeaders::kRange,
                       "bytes=0-0,10-200,200-300");
     r.SetExtraRequestHeaders(headers);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
     EXPECT_TRUE(d.request_failed());
   }
 
   EXPECT_TRUE(file_util::Delete(temp_path, false));
 }
 
 TEST_F(URLRequestTest, InvalidUrlTest) {
   TestDelegate d;
   {
-    URLRequest r(GURL("invalid url"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(GURL("invalid url"), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
     EXPECT_TRUE(d.request_failed());
   }
 }
 
 TEST_F(URLRequestTestHTTP, ResponseHeadersTest) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("files/with-headers.html"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(
+      test_server_.GetURL("files/with-headers.html"), &d, &default_context_);
   req.Start();
   MessageLoop::current()->Run();
 
   const HttpResponseHeaders* headers = req.response_headers();
 
   // Simple sanity check that response_info() accesses the same data.
   EXPECT_EQ(headers, req.response_info().headers.get());
 
   std::string header;
   EXPECT_TRUE(headers->GetNormalizedHeader("cache-control", &header));
@@ skipping 40 matching lines @@
   EXPECT_TRUE(SUCCEEDED(result));
   result = persist->Save(lnk_path.c_str(), TRUE);
   EXPECT_TRUE(SUCCEEDED(result));
   if (persist)
     persist->Release();
   if (shell)
     shell->Release();
 
   TestDelegate d;
   {
-    URLRequest r(FilePathToFileURL(FilePath(lnk_path)), &d);
-    r.set_context(&default_context_);
+    URLRequest r(FilePathToFileURL(FilePath(lnk_path)), &d, &default_context_);
 
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     WIN32_FILE_ATTRIBUTE_DATA data;
     GetFileAttributesEx(app_path.value().c_str(),
                         GetFileExInfoStandard, &data);
     HANDLE file = CreateFile(app_path.value().c_str(), GENERIC_READ,
@@ skipping 17 matching lines @@
   DeleteFile(lnk_path.c_str());
   CoUninitialize();
 }
 #endif  // defined(OS_WIN)
 
 TEST_F(URLRequestTestHTTP, ContentTypeNormalizationTest) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   URLRequest req(test_server_.GetURL(
-      "files/content-type-normalization.html"), &d);
-  req.set_context(&default_context_);
+      "files/content-type-normalization.html"), &d, &default_context_);
   req.Start();
   MessageLoop::current()->Run();
 
   std::string mime_type;
   req.GetMimeType(&mime_type);
   EXPECT_EQ("text/html", mime_type);
 
   std::string charset;
   req.GetCharset(&charset);
   EXPECT_EQ("utf-8", charset);
   req.Cancel();
 }
 
 TEST_F(URLRequestTest, FileDirCancelTest) {
   // Put in mock resource provider.
   NetModule::SetResourceProvider(TestNetResourceProvider);
 
   TestDelegate d;
   {
     FilePath file_path;
     PathService::Get(base::DIR_SOURCE_ROOT, &file_path);
     file_path = file_path.Append(FILE_PATH_LITERAL("net"));
     file_path = file_path.Append(FILE_PATH_LITERAL("data"));
 
-    URLRequest req(FilePathToFileURL(file_path), &d);
-    req.set_context(&default_context_);
+    URLRequest req(FilePathToFileURL(file_path), &d, &default_context_);
     req.Start();
     EXPECT_TRUE(req.is_pending());
 
     d.set_cancel_in_received_data_pending(true);
 
     MessageLoop::current()->Run();
   }
 
   // Take out mock resource provider.
   NetModule::SetResourceProvider(NULL);
 }
 
 TEST_F(URLRequestTest, FileDirRedirectNoCrash) {
   // There is an implicit redirect when loading a file path that matches a
   // directory and does not end with a slash.  Ensure that following such
   // redirects does not crash.  See http://crbug.com/18686.
 
   FilePath path;
   PathService::Get(base::DIR_SOURCE_ROOT, &path);
   path = path.Append(FILE_PATH_LITERAL("net"));
   path = path.Append(FILE_PATH_LITERAL("data"));
   path = path.Append(FILE_PATH_LITERAL("url_request_unittest"));
 
   TestDelegate d;
-  URLRequest req(FilePathToFileURL(path), &d);
-  req.set_context(&default_context_);
+  URLRequest req(FilePathToFileURL(path), &d, &default_context_);
   req.Start();
   MessageLoop::current()->Run();
 
   ASSERT_EQ(1, d.received_redirect_count());
   ASSERT_LT(0, d.bytes_received());
   ASSERT_FALSE(d.request_failed());
   ASSERT_TRUE(req.status().is_success());
 }
 
 #if defined(OS_WIN)
 // Don't accept the url "file:///" on windows. See http://crbug.com/1474.
 TEST_F(URLRequestTest, FileDirRedirectSingleSlash) {
   TestDelegate d;
-  URLRequest req(GURL("file:///"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(GURL("file:///"), &d, &default_context_);
   req.Start();
   MessageLoop::current()->Run();
 
   ASSERT_EQ(1, d.received_redirect_count());
   ASSERT_FALSE(req.status().is_success());
 }
 #endif
 
 TEST_F(URLRequestTestHTTP, RestrictRedirects) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   URLRequest req(test_server_.GetURL(
-      "files/redirect-to-file.html"), &d);
-  req.set_context(&default_context_);
+      "files/redirect-to-file.html"), &d, &default_context_);
   req.Start();
   MessageLoop::current()->Run();
 
   EXPECT_EQ(URLRequestStatus::FAILED, req.status().status());
   EXPECT_EQ(ERR_UNSAFE_REDIRECT, req.status().error());
 }
 
 TEST_F(URLRequestTestHTTP, RedirectToInvalidURL) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   URLRequest req(test_server_.GetURL(
-      "files/redirect-to-invalid-url.html"), &d);
-  req.set_context(&default_context_);
+      "files/redirect-to-invalid-url.html"), &d, &default_context_);
   req.Start();
   MessageLoop::current()->Run();
 
   EXPECT_EQ(URLRequestStatus::FAILED, req.status().status());
   EXPECT_EQ(ERR_INVALID_URL, req.status().error());
 }
 
 TEST_F(URLRequestTestHTTP, NoUserPassInReferrer) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("echoheader?Referer"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(
+      test_server_.GetURL("echoheader?Referer"), &d, &default_context_);
   req.set_referrer("http://user:pass@foo.com/");
   req.Start();
   MessageLoop::current()->Run();
 
   EXPECT_EQ(std::string("http://foo.com/"), d.data_received());
 }
 
 TEST_F(URLRequestTestHTTP, CancelRedirect) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
     d.set_cancel_in_received_redirect(true);
-    URLRequest req(test_server_.GetURL("files/redirect-test.html"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server_.GetURL("files/redirect-test.html"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.response_started_count());
     EXPECT_EQ(0, d.bytes_received());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_EQ(URLRequestStatus::CANCELED, req.status().status());
   }
 }
 
 TEST_F(URLRequestTestHTTP, DeferredRedirect) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
     d.set_quit_on_redirect(true);
-    URLRequest req(test_server_.GetURL("files/redirect-test.html"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server_.GetURL("files/redirect-test.html"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.received_redirect_count());
 
     req.FollowDeferredRedirect();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.response_started_count());
     EXPECT_FALSE(d.received_data_before_response());
@@ skipping 11 matching lines @@
     EXPECT_EQ(contents, d.data_received());
   }
 }
 
 TEST_F(URLRequestTestHTTP, CancelDeferredRedirect) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
     d.set_quit_on_redirect(true);
-    URLRequest req(test_server_.GetURL("files/redirect-test.html"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server_.GetURL("files/redirect-test.html"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.received_redirect_count());
 
     req.Cancel();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(1, d.response_started_count());
     EXPECT_EQ(0, d.bytes_received());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_EQ(URLRequestStatus::CANCELED, req.status().status());
   }
 }
 
 TEST_F(URLRequestTestHTTP, VaryHeader) {
   ASSERT_TRUE(test_server_.Start());
 
   // populate the cache
   {
     TestDelegate d;
-    URLRequest req(test_server_.GetURL("echoheadercache?foo"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server_.GetURL("echoheadercache?foo"), &d, &default_context_);
     HttpRequestHeaders headers;
     headers.SetHeader("foo", "1");
     req.SetExtraRequestHeaders(headers);
     req.Start();
     MessageLoop::current()->Run();
   }
 
   // expect a cache hit
   {
     TestDelegate d;
-    URLRequest req(test_server_.GetURL("echoheadercache?foo"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server_.GetURL("echoheadercache?foo"), &d, &default_context_);
     HttpRequestHeaders headers;
     headers.SetHeader("foo", "1");
     req.SetExtraRequestHeaders(headers);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(req.was_cached());
   }
 
   // expect a cache miss
   {
     TestDelegate d;
-    URLRequest req(test_server_.GetURL("echoheadercache?foo"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server_.GetURL("echoheadercache?foo"), &d, &default_context_);
     HttpRequestHeaders headers;
     headers.SetHeader("foo", "2");
     req.SetExtraRequestHeaders(headers);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_FALSE(req.was_cached());
   }
 }
 
 TEST_F(URLRequestTestHTTP, BasicAuth) {
   ASSERT_TRUE(test_server_.Start());
 
   // populate the cache
   {
     TestDelegate d;
     d.set_credentials(AuthCredentials(kUser, kSecret));
 
-    URLRequest r(test_server_.GetURL("auth-basic"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("auth-basic"), &d, &default_context_);
     r.Start();
 
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("user/secret") != std::string::npos);
   }
 
   // repeat request with end-to-end validation.  since auth-basic results in a
   // cachable page, we expect this test to result in a 304.  in which case, the
   // response should be fetched from the cache.
   {
     TestDelegate d;
     d.set_credentials(AuthCredentials(kUser, kSecret));
 
-    URLRequest r(test_server_.GetURL("auth-basic"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("auth-basic"), &d, &default_context_);
     r.set_load_flags(LOAD_VALIDATE_CACHE);
     r.Start();
 
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("user/secret") != std::string::npos);
 
     // Should be the same cached document.
     EXPECT_TRUE(r.was_cached());
   }
@@ skipping 11 matching lines @@
   // Verify that when the transaction is restarted, it includes the new cookie.
   {
     TestNetworkDelegate network_delegate;  // must outlive URLRequest
     TestURLRequestContext context(true);
     context.set_network_delegate(&network_delegate);
     context.Init();
 
     TestDelegate d;
     d.set_credentials(AuthCredentials(kUser, kSecret));
 
-    URLRequest r(url_requiring_auth, &d);
-    r.set_context(&context);
+    URLRequest r(url_requiring_auth, &d, &context);
     r.Start();
 
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("user/secret") != std::string::npos);
 
     // Make sure we sent the cookie in the restarted transaction.
     EXPECT_TRUE(d.data_received().find("Cookie: got_challenged=true")
         != std::string::npos);
   }
 
   // Same test as above, except this time the restart is initiated earlier
   // (without user intervention since identity is embedded in the URL).
   {
     TestNetworkDelegate network_delegate;  // must outlive URLRequest
     TestURLRequestContext context(true);
     context.set_network_delegate(&network_delegate);
     context.Init();
 
     TestDelegate d;
 
     GURL::Replacements replacements;
     std::string username("user2");
     std::string password("secret");
     replacements.SetUsernameStr(username);
     replacements.SetPasswordStr(password);
     GURL url_with_identity = url_requiring_auth.ReplaceComponents(replacements);
 
-    URLRequest r(url_with_identity, &d);
-    r.set_context(&context);
+    URLRequest r(url_with_identity, &d, &context);
     r.Start();
 
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("user2/secret") != std::string::npos);
 
     // Make sure we sent the cookie in the restarted transaction.
     EXPECT_TRUE(d.data_received().find("Cookie: got_challenged=true")
         != std::string::npos);
   }
 }
 
 TEST_F(URLRequestTest, DelayedCookieCallback) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
   TestURLRequestContext context;
   scoped_refptr<DelayedCookieMonster> delayed_cm =
       new DelayedCookieMonster();
   scoped_refptr<CookieStore> cookie_store = delayed_cm;
   context.set_cookie_store(delayed_cm);
 
   // Set up a cookie.
   {
     TestNetworkDelegate network_delegate;
     context.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("set-cookie?CookieToNotSend=1"), &d);
-    req.set_context(&context);
+    URLRequest req(
+        test_server.GetURL("set-cookie?CookieToNotSend=1"), &d, &context);
     req.Start();
     MessageLoop::current()->Run();
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
     EXPECT_EQ(1, network_delegate.set_cookie_count());
   }
 
   // Verify that the cookie is set.
   {
     TestNetworkDelegate network_delegate;
     context.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("echoheader?Cookie"), &d);
-    req.set_context(&context);
+    URLRequest req(test_server.GetURL("echoheader?Cookie"), &d, &context);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("CookieToNotSend=1")
                 != std::string::npos);
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 }
 
 TEST_F(URLRequestTest, DoNotSendCookies) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
   // Set up a cookie.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("set-cookie?CookieToNotSend=1"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(test_server.GetURL("set-cookie?CookieToNotSend=1"),
+                   &d,
+                   &default_context_);
     req.Start();
     MessageLoop::current()->Run();
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 
   // Verify that the cookie is set.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("echoheader?Cookie"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL("echoheader?Cookie"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("CookieToNotSend=1")
                 != std::string::npos);
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 
   // Verify that the cookie isn't sent when LOAD_DO_NOT_SEND_COOKIES is set.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("echoheader?Cookie"), &d);
+    URLRequest req(
+        test_server.GetURL("echoheader?Cookie"), &d, &default_context_);
     req.set_load_flags(LOAD_DO_NOT_SEND_COOKIES);
-    req.set_context(&default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("Cookie: CookieToNotSend=1")
                 == std::string::npos);
 
     // LOAD_DO_NOT_SEND_COOKIES does not trigger OnGetCookies.
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 }
 
 TEST_F(URLRequestTest, DoNotSaveCookies) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
   // Set up a cookie.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("set-cookie?CookieToNotUpdate=2"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(test_server.GetURL("set-cookie?CookieToNotUpdate=2"),
+                   &d,
+                   &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
     EXPECT_EQ(1, network_delegate.set_cookie_count());
   }
 
   // Try to set-up another cookie and update the previous cookie.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL(
-        "set-cookie?CookieToNotSave=1&CookieToNotUpdate=1"), &d);
+    URLRequest req(
+        test_server.GetURL("set-cookie?CookieToNotSave=1&CookieToNotUpdate=1"),
+        &d,
+        &default_context_);
     req.set_load_flags(LOAD_DO_NOT_SAVE_COOKIES);
-    req.set_context(&default_context_);
     req.Start();
 
     MessageLoop::current()->Run();
 
     // LOAD_DO_NOT_SAVE_COOKIES does not trigger OnSetCookie.
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
     EXPECT_EQ(0, network_delegate.set_cookie_count());
   }
 
   // Verify the cookies weren't saved or updated.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("echoheader?Cookie"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL("echoheader?Cookie"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("CookieToNotSave=1")
                 == std::string::npos);
     EXPECT_TRUE(d.data_received().find("CookieToNotUpdate=2")
                 != std::string::npos);
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
     EXPECT_EQ(0, network_delegate.set_cookie_count());
   }
 }
 
 TEST_F(URLRequestTest, DoNotSendCookies_ViaPolicy) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
   // Set up a cookie.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("set-cookie?CookieToNotSend=1"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(test_server.GetURL("set-cookie?CookieToNotSend=1"),
+                   &d,
+                   &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 
   // Verify that the cookie is set.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("echoheader?Cookie"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL("echoheader?Cookie"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("CookieToNotSend=1")
                 != std::string::npos);
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 
   // Verify that the cookie isn't sent.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
     network_delegate.set_cookie_options(TestNetworkDelegate::NO_GET_COOKIES);
-    URLRequest req(test_server.GetURL("echoheader?Cookie"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL("echoheader?Cookie"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("Cookie: CookieToNotSend=1")
                 == std::string::npos);
 
     EXPECT_EQ(1, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 }
 
 TEST_F(URLRequestTest, DoNotSaveCookies_ViaPolicy) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
   // Set up a cookie.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("set-cookie?CookieToNotUpdate=2"),  &d);
-    req.set_context(&default_context_);
+    URLRequest req(test_server.GetURL("set-cookie?CookieToNotUpdate=2"),
+                   &d,
+                   &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 
   // Try to set-up another cookie and update the previous cookie.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
     network_delegate.set_cookie_options(TestNetworkDelegate::NO_SET_COOKIE);
-    URLRequest req(test_server.GetURL(
-        "set-cookie?CookieToNotSave=1&CookieToNotUpdate=1"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL("set-cookie?CookieToNotSave=1&CookieToNotUpdate=1"),
+        &d,
+        &default_context_);
     req.Start();
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(2, network_delegate.blocked_set_cookie_count());
   }
 
   // Verify the cookies weren't saved or updated.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("echoheader?Cookie"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL("echoheader?Cookie"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("CookieToNotSave=1")
                 == std::string::npos);
     EXPECT_TRUE(d.data_received().find("CookieToNotUpdate=2")
                 != std::string::npos);
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 }
 
 TEST_F(URLRequestTest, DoNotSaveEmptyCookies) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
   // Set up an empty cookie.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("set-cookie"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(test_server.GetURL("set-cookie"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
     EXPECT_EQ(0, network_delegate.set_cookie_count());
   }
 }
 
 TEST_F(URLRequestTest, DoNotSendCookies_ViaPolicy_Async) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
   // Set up a cookie.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("set-cookie?CookieToNotSend=1"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(test_server.GetURL("set-cookie?CookieToNotSend=1"),
+                   &d,
+                   &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 
   // Verify that the cookie is set.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("echoheader?Cookie"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL("echoheader?Cookie"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("CookieToNotSend=1")
                 != std::string::npos);
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 
   // Verify that the cookie isn't sent.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
     network_delegate.set_cookie_options(TestNetworkDelegate::NO_GET_COOKIES);
-    URLRequest req(test_server.GetURL("echoheader?Cookie"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL("echoheader?Cookie"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("Cookie: CookieToNotSend=1")
                 == std::string::npos);
 
     EXPECT_EQ(1, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 }
 
 TEST_F(URLRequestTest, DoNotSaveCookies_ViaPolicy_Async) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
   // Set up a cookie.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("set-cookie?CookieToNotUpdate=2"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(test_server.GetURL("set-cookie?CookieToNotUpdate=2"),
+                   &d,
+                   &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
 
   // Try to set-up another cookie and update the previous cookie.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
     network_delegate.set_cookie_options(TestNetworkDelegate::NO_SET_COOKIE);
-    URLRequest req(test_server.GetURL(
-        "set-cookie?CookieToNotSave=1&CookieToNotUpdate=1"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL("set-cookie?CookieToNotSave=1&CookieToNotUpdate=1"),
+        &d,
+        &default_context_);
     req.Start();
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(2, network_delegate.blocked_set_cookie_count());
   }
 
   // Verify the cookies weren't saved or updated.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
-    URLRequest req(test_server.GetURL("echoheader?Cookie"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL("echoheader?Cookie"), &d, &default_context_);
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_TRUE(d.data_received().find("CookieToNotSave=1")
                 == std::string::npos);
     EXPECT_TRUE(d.data_received().find("CookieToNotUpdate=2")
                 != std::string::npos);
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
@@ skipping 10 matching lines @@
 TEST_F(URLRequestTest, CookiePolicy_ForceSession) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
   // Set up a cookie.
   {
     TestNetworkDelegate network_delegate;
     default_context_.set_network_delegate(&network_delegate);
     TestDelegate d;
     network_delegate.set_cookie_options(TestNetworkDelegate::FORCE_SESSION);
-    URLRequest req(test_server.GetURL(
-        "set-cookie?A=1;expires=\"Fri, 05 Feb 2010 23:42:01 GMT\""), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL(
+            "set-cookie?A=1;expires=\"Fri, 05 Feb 2010 23:42:01 GMT\""),
+        &d,
+        &default_context_);
     req.Start();  // Triggers an asynchronous cookie policy check.
 
     MessageLoop::current()->Run();
 
     EXPECT_EQ(0, network_delegate.blocked_get_cookies_count());
     EXPECT_EQ(0, network_delegate.blocked_set_cookie_count());
   }
   default_context_.set_network_delegate(&default_network_delegate_);
 
   // Now, check the cookie store.
   bool was_run = false;
   default_context_.cookie_store()->GetCookieMonster()->GetAllCookiesAsync(
       base::Bind(&CheckCookiePolicyCallback, &was_run));
   MessageLoop::current()->RunAllPending();
   DCHECK(was_run);
 }
 
 // In this test, we do a POST which the server will 302 redirect.
 // The subsequent transaction should use GET, and should not send the
 // Content-Type header.
 // http://code.google.com/p/chromium/issues/detail?id=843
 TEST_F(URLRequestTestHTTP, Post302RedirectGet) {
   ASSERT_TRUE(test_server_.Start());
 
   const char kData[] = "hello world";
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("files/redirect-to-echoall"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(
+      test_server_.GetURL("files/redirect-to-echoall"), &d, &default_context_);
   req.set_method("POST");
   req.set_upload(CreateSimpleUploadData(kData));
 
   // Set headers (some of which are specific to the POST).
   HttpRequestHeaders headers;
   headers.AddHeadersFromString(
     "Content-Type: multipart/form-data; "
     "boundary=----WebKitFormBoundaryAADeAA+NAAWMAAwZ\r\n"
     "Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,"
     "text/plain;q=0.8,image/png,*/*;q=0.5\r\n"
@@ skipping 65 matching lines @@
   HTTPRedirectMethodTest(url, "PUT", "PUT", true);
   HTTPRedirectMethodTest(url, "HEAD", "HEAD", false);
 }
 
 TEST_F(URLRequestTestHTTP, InterceptPost302RedirectGet) {
   ASSERT_TRUE(test_server_.Start());
 
   const char kData[] = "hello world";
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("empty.html"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(test_server_.GetURL("empty.html"), &d, &default_context_);
   req.set_method("POST");
   req.set_upload(CreateSimpleUploadData(kData).get());
   HttpRequestHeaders headers;
   headers.SetHeader(HttpRequestHeaders::kContentLength,
                     base::UintToString(arraysize(kData) - 1));
   req.SetExtraRequestHeaders(headers);
 
   URLRequestRedirectJob* job =
       new URLRequestRedirectJob(&req, test_server_.GetURL("echo"));
   AddTestInterceptor()->set_main_intercept_job(job);
 
   req.Start();
   MessageLoop::current()->Run();
   EXPECT_EQ("GET", req.method());
 }
 
 TEST_F(URLRequestTestHTTP, InterceptPost307RedirectPost) {
   ASSERT_TRUE(test_server_.Start());
 
   const char kData[] = "hello world";
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("empty.html"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(test_server_.GetURL("empty.html"), &d, &default_context_);
   req.set_method("POST");
   req.set_upload(CreateSimpleUploadData(kData).get());
   HttpRequestHeaders headers;
   headers.SetHeader(HttpRequestHeaders::kContentLength,
                     base::UintToString(arraysize(kData) - 1));
   req.SetExtraRequestHeaders(headers);
 
   URLRequestRedirectJob* job =
       new URLRequestRedirectJob(&req, test_server_.GetURL("echo"));
   job->set_redirect_code(
@@ skipping 198 matching lines @@
 
 TEST_F(URLRequestTest, Intercept) {
   TestInterceptor interceptor;
 
   // intercept the main request and respond with a simple response
   interceptor.intercept_main_request_ = true;
   interceptor.main_headers_ = TestInterceptor::ok_headers();
   interceptor.main_data_ = TestInterceptor::ok_data();
 
   TestDelegate d;
-  URLRequest req(GURL("http://test_intercept/foo"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(GURL("http://test_intercept/foo"), &d, &default_context_);
   base::SupportsUserData::Data* user_data0 = new base::SupportsUserData::Data();
   base::SupportsUserData::Data* user_data1 = new base::SupportsUserData::Data();
   base::SupportsUserData::Data* user_data2 = new base::SupportsUserData::Data();
   req.SetUserData(NULL, user_data0);
   req.SetUserData(&user_data1, user_data1);
   req.SetUserData(&user_data2, user_data2);
   req.set_method("GET");
   req.Start();
   MessageLoop::current()->Run();
 
@@ skipping 20 matching lines @@
   interceptor.intercept_main_request_ = true;
   interceptor.main_headers_ = TestInterceptor::redirect_headers();
   interceptor.main_data_ = TestInterceptor::redirect_data();
 
   // intercept that redirect and respond a final OK response
   interceptor.intercept_redirect_ = true;
   interceptor.redirect_headers_ =  TestInterceptor::ok_headers();
   interceptor.redirect_data_ = TestInterceptor::ok_data();
 
   TestDelegate d;
-  URLRequest req(GURL("http://test_intercept/foo"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(GURL("http://test_intercept/foo"), &d, &default_context_);
   req.set_method("GET");
   req.Start();
   MessageLoop::current()->Run();
 
   // Check the interceptor got called as expected
   EXPECT_TRUE(interceptor.did_intercept_main_);
   EXPECT_TRUE(interceptor.did_intercept_redirect_);
 
   // Check we got one good response
   EXPECT_TRUE(req.status().is_success());
@@ skipping 12 matching lines @@
   interceptor.intercept_main_request_ = true;
   interceptor.main_headers_ = TestInterceptor::error_headers();
   interceptor.main_data_ = TestInterceptor::error_data();
 
   // intercept that error and respond with an OK response
   interceptor.intercept_final_response_ = true;
   interceptor.final_headers_ = TestInterceptor::ok_headers();
   interceptor.final_data_ = TestInterceptor::ok_data();
 
   TestDelegate d;
-  URLRequest req(GURL("http://test_intercept/foo"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(GURL("http://test_intercept/foo"), &d, &default_context_);
   req.set_method("GET");
   req.Start();
   MessageLoop::current()->Run();
 
   // Check the interceptor got called as expected
   EXPECT_TRUE(interceptor.did_intercept_main_);
   EXPECT_TRUE(interceptor.did_intercept_final_);
 
   // Check we got one good response
   EXPECT_TRUE(req.status().is_success());
   EXPECT_EQ(200, req.response_headers()->response_code());
   EXPECT_EQ(TestInterceptor::ok_data(), d.data_received());
   EXPECT_EQ(1, d.response_started_count());
   EXPECT_EQ(0, d.received_redirect_count());
 }
 
 TEST_F(URLRequestTest, InterceptNetworkError) {
   TestInterceptor interceptor;
 
   // intercept the main request to simulate a network error
   interceptor.simulate_main_network_error_ = true;
 
   // intercept that error and respond with an OK response
   interceptor.intercept_final_response_ = true;
   interceptor.final_headers_ = TestInterceptor::ok_headers();
   interceptor.final_data_ = TestInterceptor::ok_data();
 
   TestDelegate d;
-  URLRequest req(GURL("http://test_intercept/foo"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(GURL("http://test_intercept/foo"), &d, &default_context_);
   req.set_method("GET");
   req.Start();
   MessageLoop::current()->Run();
 
   // Check the interceptor got called as expected
   EXPECT_TRUE(interceptor.did_simulate_error_main_);
   EXPECT_TRUE(interceptor.did_intercept_final_);
 
   // Check we received one good response
   EXPECT_TRUE(req.status().is_success());
   EXPECT_EQ(200, req.response_headers()->response_code());
   EXPECT_EQ(TestInterceptor::ok_data(), d.data_received());
   EXPECT_EQ(1, d.response_started_count());
   EXPECT_EQ(0, d.received_redirect_count());
 }
 
 TEST_F(URLRequestTest, InterceptRestartRequired) {
   TestInterceptor interceptor;
 
   // restart the main request
   interceptor.restart_main_request_ = true;
 
   // then intercept the new main request and respond with an OK response
   interceptor.intercept_main_request_ = true;
   interceptor.main_headers_ = TestInterceptor::ok_headers();
   interceptor.main_data_ = TestInterceptor::ok_data();
 
   TestDelegate d;
-  URLRequest req(GURL("http://test_intercept/foo"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(GURL("http://test_intercept/foo"), &d, &default_context_);
   req.set_method("GET");
   req.Start();
   MessageLoop::current()->Run();
 
   // Check the interceptor got called as expected
   EXPECT_TRUE(interceptor.did_restart_main_);
   EXPECT_TRUE(interceptor.did_intercept_main_);
 
   // Check we received one good response
   EXPECT_TRUE(req.status().is_success());
@@ skipping 10 matching lines @@
 
   // intercept the main request and cancel from within the restarted job
   interceptor.cancel_main_request_ = true;
 
   // setup to intercept final response and override it with an OK response
   interceptor.intercept_final_response_ = true;
   interceptor.final_headers_ = TestInterceptor::ok_headers();
   interceptor.final_data_ = TestInterceptor::ok_data();
 
   TestDelegate d;
-  URLRequest req(GURL("http://test_intercept/foo"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(GURL("http://test_intercept/foo"), &d, &default_context_);
   req.set_method("GET");
   req.Start();
   MessageLoop::current()->Run();
 
   // Check the interceptor got called as expected
   EXPECT_TRUE(interceptor.did_cancel_main_);
   EXPECT_FALSE(interceptor.did_intercept_final_);
 
   // Check we see a canceled request
   EXPECT_FALSE(req.status().is_success());
@@ skipping 10 matching lines @@
 
   // intercept the redirect and cancel from within that job
   interceptor.cancel_redirect_request_ = true;
 
   // setup to intercept final response and override it with an OK response
   interceptor.intercept_final_response_ = true;
   interceptor.final_headers_ = TestInterceptor::ok_headers();
   interceptor.final_data_ = TestInterceptor::ok_data();
 
   TestDelegate d;
-  URLRequest req(GURL("http://test_intercept/foo"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(GURL("http://test_intercept/foo"), &d, &default_context_);
   req.set_method("GET");
   req.Start();
   MessageLoop::current()->Run();
 
   // Check the interceptor got called as expected
   EXPECT_TRUE(interceptor.did_intercept_main_);
   EXPECT_TRUE(interceptor.did_cancel_redirect_);
   EXPECT_FALSE(interceptor.did_intercept_final_);
 
   // Check we see a canceled request
   EXPECT_FALSE(req.status().is_success());
   EXPECT_EQ(URLRequestStatus::CANCELED, req.status().status());
 }
 
 TEST_F(URLRequestTest, InterceptRespectsCancelFinal) {
   TestInterceptor interceptor;
 
   // intercept the main request to simulate a network error
   interceptor.simulate_main_network_error_ = true;
 
   // setup to intercept final response and cancel from within that job
   interceptor.cancel_final_request_ = true;
 
   TestDelegate d;
-  URLRequest req(GURL("http://test_intercept/foo"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(GURL("http://test_intercept/foo"), &d, &default_context_);
   req.set_method("GET");
   req.Start();
   MessageLoop::current()->Run();
 
   // Check the interceptor got called as expected
   EXPECT_TRUE(interceptor.did_simulate_error_main_);
   EXPECT_TRUE(interceptor.did_cancel_final_);
 
   // Check we see a canceled request
   EXPECT_FALSE(req.status().is_success());
   EXPECT_EQ(URLRequestStatus::CANCELED, req.status().status());
 }
 
 TEST_F(URLRequestTest, InterceptRespectsCancelInRestart) {
   TestInterceptor interceptor;
 
   // intercept the main request and cancel then restart from within that job
   interceptor.cancel_then_restart_main_request_ = true;
 
   // setup to intercept final response and override it with an OK response
   interceptor.intercept_final_response_ = true;
   interceptor.final_headers_ = TestInterceptor::ok_headers();
   interceptor.final_data_ = TestInterceptor::ok_data();
 
   TestDelegate d;
-  URLRequest req(GURL("http://test_intercept/foo"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(GURL("http://test_intercept/foo"), &d, &default_context_);
   req.set_method("GET");
   req.Start();
   MessageLoop::current()->Run();
 
   // Check the interceptor got called as expected
   EXPECT_TRUE(interceptor.did_cancel_then_restart_main_);
   EXPECT_FALSE(interceptor.did_intercept_final_);
 
   // Check we see a canceled request
   EXPECT_FALSE(req.status().is_success());
   EXPECT_EQ(URLRequestStatus::CANCELED, req.status().status());
 }
 
 // Check that two different URL requests have different identifiers.
 TEST_F(URLRequestTest, Identifiers) {
   TestDelegate d;
-  TestURLRequest req(GURL("http://example.com"), &d);
-  TestURLRequest other_req(GURL("http://example.com"), &d);
+  TestURLRequestContext context;
+  TestURLRequest req(GURL("http://example.com"), &d, &context);
+  TestURLRequest other_req(GURL("http://example.com"), &d, &context);
 
   ASSERT_NE(req.identifier(), other_req.identifier());
 }
 
 // Check that a failure to connect to the proxy is reported to the network
 // delegate.
 TEST_F(URLRequestTest, NetworkDelegateProxyError) {
   MockHostResolver host_resolver;
   host_resolver.rules()->AddSimulatedFailure("*");
 
   TestNetworkDelegate network_delegate;  // must outlive URLRequests
   TestURLRequestContextWithProxy context("myproxy:70", &network_delegate);
 
   TestDelegate d;
-  URLRequest req(GURL("http://example.com"), &d);
-  req.set_context(&context);
+  URLRequest req(GURL("http://example.com"), &d, &context);
   req.set_method("GET");
 
   req.Start();
   MessageLoop::current()->Run();
 
   // Check we see a failed request.
   EXPECT_FALSE(req.status().is_success());
   EXPECT_EQ(URLRequestStatus::FAILED, req.status().status());
   EXPECT_EQ(ERR_PROXY_CONNECTION_FAILED, req.status().error());
 
   EXPECT_EQ(1, network_delegate.error_count());
   EXPECT_EQ(ERR_PROXY_CONNECTION_FAILED, network_delegate.last_error());
   EXPECT_EQ(1, network_delegate.completed_requests());
 }
 
 // Check that it is impossible to change the referrer in the extra headers of
 // an URLRequest.
 TEST_F(URLRequestTest, DoNotOverrideReferrer) {
   LocalHttpTestServer test_server;
   ASSERT_TRUE(test_server.Start());
 
   // If extra headers contain referer and the request contains a referer,
   // only the latter shall be respected.
   {
     TestDelegate d;
-    URLRequest req(test_server.GetURL("echoheader?Referer"), &d);
+    URLRequest req(
+        test_server.GetURL("echoheader?Referer"), &d, &default_context_);
     req.set_referrer("http://foo.com/");
-    req.set_context(&default_context_);
 
     HttpRequestHeaders headers;
     headers.SetHeader(HttpRequestHeaders::kReferer, "http://bar.com/");
     req.SetExtraRequestHeaders(headers);
 
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ("http://foo.com/", d.data_received());
   }
 
   // If extra headers contain a referer but the request does not, no referer
   // shall be sent in the header.
   {
     TestDelegate d;
-    URLRequest req(test_server.GetURL("echoheader?Referer"), &d);
-    req.set_context(&default_context_);
+    URLRequest req(
+        test_server.GetURL("echoheader?Referer"), &d, &default_context_);
 
     HttpRequestHeaders headers;
     headers.SetHeader(HttpRequestHeaders::kReferer, "http://bar.com/");
     req.SetExtraRequestHeaders(headers);
     req.set_load_flags(LOAD_VALIDATE_CACHE);
 
     req.Start();
     MessageLoop::current()->Run();
 
     EXPECT_EQ("None", d.data_received());
   }
 }
 
 // Make sure that net::NetworkDelegate::NotifyCompleted is called if
 // content is empty.
 TEST_F(URLRequestTest, RequestCompletionForEmptyResponse) {
   TestDelegate d;
-  URLRequest req(GURL("data:,"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(GURL("data:,"), &d, &default_context_);
   req.Start();
   MessageLoop::current()->Run();
   EXPECT_EQ("", d.data_received());
   EXPECT_EQ(1, default_network_delegate_.completed_requests());
 }
 
 class URLRequestTestFTP : public URLRequestTest {
  public:
   URLRequestTestFTP()
       : test_server_(TestServer::TYPE_FTP, TestServer::kLocalhost, FilePath()) {
   }
 
  protected:
   TestServer test_server_;
 };
 
 // Flaky, see http://crbug.com/25045.
 TEST_F(URLRequestTestFTP, DISABLED_FTPDirectoryListing) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
   {
-    URLRequest r(test_server_.GetURL("/"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("/"), &d, &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     EXPECT_FALSE(r.is_pending());
     EXPECT_EQ(1, d.response_started_count());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_LT(0, d.bytes_received());
     EXPECT_EQ(test_server_.host_port_pair().host(),
               r.GetSocketAddress().host());
     EXPECT_EQ(test_server_.host_port_pair().port(),
               r.GetSocketAddress().port());
   }
 }
 
 // Flaky, see http://crbug.com/25045.
 TEST_F(URLRequestTestFTP, DISABLED_FTPGetTestAnonymous) {
   ASSERT_TRUE(test_server_.Start());
 
   FilePath app_path;
   PathService::Get(base::DIR_SOURCE_ROOT, &app_path);
   app_path = app_path.AppendASCII("LICENSE");
   TestDelegate d;
   {
-    URLRequest r(test_server_.GetURL("/LICENSE"), &d);
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("/LICENSE"), &d, &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     int64 file_size = 0;
     file_util::GetFileSize(app_path, &file_size);
 
     EXPECT_FALSE(r.is_pending());
     EXPECT_EQ(1, d.response_started_count());
@@ skipping 10 matching lines @@
 TEST_F(URLRequestTestFTP, DISABLED_FTPGetTest) {
   ASSERT_TRUE(test_server_.Start());
 
   FilePath app_path;
   PathService::Get(base::DIR_SOURCE_ROOT, &app_path);
   app_path = app_path.AppendASCII("LICENSE");
   TestDelegate d;
   {
     URLRequest r(
         test_server_.GetURLWithUserAndPassword("/LICENSE", "chrome", "chrome"),
-        &d);
-    r.set_context(&default_context_);
+        &d,
+        &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     int64 file_size = 0;
     file_util::GetFileSize(app_path, &file_size);
 
     EXPECT_FALSE(r.is_pending());
     EXPECT_EQ(test_server_.host_port_pair().host(),
@@ skipping 12 matching lines @@
 
   FilePath app_path;
   PathService::Get(base::DIR_SOURCE_ROOT, &app_path);
   app_path = app_path.AppendASCII("LICENSE");
   TestDelegate d;
   {
     URLRequest r(
         test_server_.GetURLWithUserAndPassword("/LICENSE",
                                                "chrome",
                                                "wrong_password"),
-        &d);
-    r.set_context(&default_context_);
+        &d,
+        &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     int64 file_size = 0;
     file_util::GetFileSize(app_path, &file_size);
 
     EXPECT_FALSE(r.is_pending());
     EXPECT_EQ(1, d.response_started_count());
@@ skipping 11 matching lines @@
   app_path = app_path.AppendASCII("LICENSE");
   TestDelegate d;
   // Set correct login credentials. The delegate will be asked for them when
   // the initial login with wrong credentials will fail.
   d.set_credentials(AuthCredentials(kChrome, kChrome));
   {
     URLRequest r(
         test_server_.GetURLWithUserAndPassword("/LICENSE",
                                                "chrome",
                                                "wrong_password"),
-        &d);
-    r.set_context(&default_context_);
+        &d,
+        &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     int64 file_size = 0;
     file_util::GetFileSize(app_path, &file_size);
 
     EXPECT_FALSE(r.is_pending());
     EXPECT_EQ(1, d.response_started_count());
     EXPECT_FALSE(d.received_data_before_response());
     EXPECT_EQ(d.bytes_received(), static_cast<int>(file_size));
   }
 }
 
 // Flaky, see http://crbug.com/25045.
 TEST_F(URLRequestTestFTP, DISABLED_FTPCheckWrongUser) {
   ASSERT_TRUE(test_server_.Start());
 
   FilePath app_path;
   PathService::Get(base::DIR_SOURCE_ROOT, &app_path);
   app_path = app_path.AppendASCII("LICENSE");
   TestDelegate d;
   {
     URLRequest r(
         test_server_.GetURLWithUserAndPassword("/LICENSE",
                                                "wrong_user",
                                                "chrome"),
-        &d);
-    r.set_context(&default_context_);
+        &d,
+        &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     int64 file_size = 0;
     file_util::GetFileSize(app_path, &file_size);
 
     EXPECT_FALSE(r.is_pending());
     EXPECT_EQ(1, d.response_started_count());
@@ skipping 11 matching lines @@
   app_path = app_path.AppendASCII("LICENSE");
   TestDelegate d;
   // Set correct login credentials. The delegate will be asked for them when
   // the initial login with wrong credentials will fail.
   d.set_credentials(AuthCredentials(kChrome, kChrome));
   {
     URLRequest r(
         test_server_.GetURLWithUserAndPassword("/LICENSE",
                                                "wrong_user",
                                                "chrome"),
-        &d);
-    r.set_context(&default_context_);
+        &d,
+        &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     int64 file_size = 0;
     file_util::GetFileSize(app_path, &file_size);
 
     EXPECT_FALSE(r.is_pending());
     EXPECT_EQ(1, d.response_started_count());
@@ skipping 10 matching lines @@
   PathService::Get(base::DIR_SOURCE_ROOT, &app_path);
   app_path = app_path.AppendASCII("LICENSE");
 
   scoped_ptr<TestDelegate> d(new TestDelegate);
   {
     // Pass correct login identity in the URL.
     URLRequest r(
         test_server_.GetURLWithUserAndPassword("/LICENSE",
                                                "chrome",
                                                "chrome"),
-        d.get());
-    r.set_context(&default_context_);
+        d.get(),
+        &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     int64 file_size = 0;
     file_util::GetFileSize(app_path, &file_size);
 
     EXPECT_FALSE(r.is_pending());
     EXPECT_EQ(1, d->response_started_count());
     EXPECT_FALSE(d->received_data_before_response());
     EXPECT_EQ(d->bytes_received(), static_cast<int>(file_size));
   }
 
   d.reset(new TestDelegate);
   {
     // This request should use cached identity from previous request.
-    URLRequest r(test_server_.GetURL("/LICENSE"), d.get());
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("/LICENSE"), d.get(), &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     int64 file_size = 0;
     file_util::GetFileSize(app_path, &file_size);
 
     EXPECT_FALSE(r.is_pending());
     EXPECT_EQ(1, d->response_started_count());
@@ skipping 12 matching lines @@
 
   scoped_ptr<TestDelegate> d(new TestDelegate);
   // Set correct login credentials. The delegate will be asked for them when
   // the initial login with wrong credentials will fail.
   d->set_credentials(AuthCredentials(kChrome, kChrome));
   {
     URLRequest r(
         test_server_.GetURLWithUserAndPassword("/LICENSE",
                                                "chrome",
                                                "wrong_password"),
-        d.get());
-    r.set_context(&default_context_);
+        d.get(),
+        &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     int64 file_size = 0;
     file_util::GetFileSize(app_path, &file_size);
 
     EXPECT_FALSE(r.is_pending());
     EXPECT_EQ(1, d->response_started_count());
     EXPECT_FALSE(d->received_data_before_response());
     EXPECT_EQ(d->bytes_received(), static_cast<int>(file_size));
   }
 
   // Use a new delegate without explicit credentials. The cached ones should be
   // used.
   d.reset(new TestDelegate);
   {
     // Don't pass wrong credentials in the URL, they would override valid cached
     // ones.
-    URLRequest r(test_server_.GetURL("/LICENSE"), d.get());
-    r.set_context(&default_context_);
+    URLRequest r(test_server_.GetURL("/LICENSE"), d.get(), &default_context_);
     r.Start();
     EXPECT_TRUE(r.is_pending());
 
     MessageLoop::current()->Run();
 
     int64 file_size = 0;
     file_util::GetFileSize(app_path, &file_size);
 
     EXPECT_FALSE(r.is_pending());
     EXPECT_EQ(1, d->response_started_count());
     EXPECT_FALSE(d->received_data_before_response());
     EXPECT_EQ(d->bytes_received(), static_cast<int>(file_size));
   }
 }
 
 // Check that default A-L header is sent.
 TEST_F(URLRequestTestHTTP, DefaultAcceptLanguage) {
   ASSERT_TRUE(test_server_.Start());
 
   TestNetworkDelegate network_delegate;  // must outlive URLRequests
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.set_accept_language("en");
   context.Init();
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("echoheader?Accept-Language"), &d);
-  req.set_context(&context);
+  URLRequest req(
+      test_server_.GetURL("echoheader?Accept-Language"), &d, &context);
   req.Start();
   MessageLoop::current()->Run();
   EXPECT_EQ("en", d.data_received());
 }
 
 // Check that an empty A-L header is not sent. http://crbug.com/77365.
 TEST_F(URLRequestTestHTTP, EmptyAcceptLanguage) {
   ASSERT_TRUE(test_server_.Start());
 
   TestNetworkDelegate network_delegate;  // must outlive URLRequests
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
   // We override the language after initialization because empty entries
   // get overridden by Init().
   context.set_accept_language("");
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("echoheader?Accept-Language"), &d);
-  req.set_context(&context);
+  URLRequest req(
+      test_server_.GetURL("echoheader?Accept-Language"), &d, &context);
   req.Start();
   MessageLoop::current()->Run();
   EXPECT_EQ("None", d.data_received());
 }
 
 // Check that if request overrides the A-L header, the default is not appended.
 // See http://crbug.com/20894
 TEST_F(URLRequestTestHTTP, OverrideAcceptLanguage) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("echoheader?Accept-Language"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(test_server_.GetURL("echoheader?Accept-Language"),
+                 &d,
+                 &default_context_);
   HttpRequestHeaders headers;
   headers.SetHeader(HttpRequestHeaders::kAcceptLanguage, "ru");
   req.SetExtraRequestHeaders(headers);
   req.Start();
   MessageLoop::current()->Run();
   EXPECT_EQ(std::string("ru"), d.data_received());
 }
 
 // Check that default A-E header is sent.
 TEST_F(URLRequestTestHTTP, DefaultAcceptEncoding) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("echoheader?Accept-Encoding"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(test_server_.GetURL("echoheader?Accept-Encoding"),
+                 &d,
+                 &default_context_);
   HttpRequestHeaders headers;
   req.SetExtraRequestHeaders(headers);
   req.Start();
   MessageLoop::current()->Run();
   EXPECT_TRUE(ContainsString(d.data_received(), "gzip"));
 }
 
 // Check that if request overrides the A-E header, the default is not appended.
 // See http://crbug.com/47381
 TEST_F(URLRequestTestHTTP, OverrideAcceptEncoding) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("echoheader?Accept-Encoding"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(test_server_.GetURL("echoheader?Accept-Encoding"),
+                 &d,
+                 &default_context_);
   HttpRequestHeaders headers;
   headers.SetHeader(HttpRequestHeaders::kAcceptEncoding, "identity");
   req.SetExtraRequestHeaders(headers);
   req.Start();
   MessageLoop::current()->Run();
   EXPECT_FALSE(ContainsString(d.data_received(), "gzip"));
   EXPECT_TRUE(ContainsString(d.data_received(), "identity"));
 }
 
 // Check that default A-C header is sent.
 TEST_F(URLRequestTestHTTP, DefaultAcceptCharset) {
   ASSERT_TRUE(test_server_.Start());
 
   TestNetworkDelegate network_delegate;  // must outlive URLRequests
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.set_accept_charset("en");
   context.Init();
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("echoheader?Accept-Charset"), &d);
-  req.set_context(&context);
+  URLRequest req(test_server_.GetURL("echoheader?Accept-Charset"),
+                 &d,
+                 &context);
   req.Start();
   MessageLoop::current()->Run();
   EXPECT_EQ("en", d.data_received());
 }
 
 // Check that an empty A-C header is not sent. http://crbug.com/77365.
 TEST_F(URLRequestTestHTTP, EmptyAcceptCharset) {
   ASSERT_TRUE(test_server_.Start());
 
   TestNetworkDelegate network_delegate;  // must outlive URLRequests
   TestURLRequestContext context(true);
   context.set_network_delegate(&network_delegate);
   context.Init();
   // We override the accepted charset after initialization because empty
   // entries get overridden otherwise.
   context.set_accept_charset("");
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("echoheader?Accept-Charset"), &d);
-  req.set_context(&context);
+  URLRequest req(test_server_.GetURL("echoheader?Accept-Charset"),
+                 &d,
+                 &context);
   req.Start();
   MessageLoop::current()->Run();
   EXPECT_EQ("None", d.data_received());
 }
 
 // Check that if request overrides the A-C header, the default is not appended.
 // See http://crbug.com/20894
 TEST_F(URLRequestTestHTTP, OverrideAcceptCharset) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("echoheader?Accept-Charset"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(test_server_.GetURL("echoheader?Accept-Charset"),
+                 &d,
+                 &default_context_);
   HttpRequestHeaders headers;
   headers.SetHeader(HttpRequestHeaders::kAcceptCharset, "koi-8r");
   req.SetExtraRequestHeaders(headers);
   req.Start();
   MessageLoop::current()->Run();
   EXPECT_EQ(std::string("koi-8r"), d.data_received());
 }
 
 // Check that default User-Agent header is sent.
 TEST_F(URLRequestTestHTTP, DefaultUserAgent) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("echoheader?User-Agent"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(test_server_.GetURL("echoheader?User-Agent"),
+                 &d,
+                 &default_context_);
   req.Start();
   MessageLoop::current()->Run();
   EXPECT_EQ(req.context()->GetUserAgent(req.url()), d.data_received());
 }
 
 // Check that if request overrides the User-Agent header,
 // the default is not appended.
 TEST_F(URLRequestTestHTTP, OverrideUserAgent) {
   ASSERT_TRUE(test_server_.Start());
 
   TestDelegate d;
-  URLRequest req(test_server_.GetURL("echoheader?User-Agent"), &d);
-  req.set_context(&default_context_);
+  URLRequest req(test_server_.GetURL("echoheader?User-Agent"),
+                 &d,
+                 &default_context_);
   HttpRequestHeaders headers;
   headers.SetHeader(HttpRequestHeaders::kUserAgent, "Lynx (textmode)");
   req.SetExtraRequestHeaders(headers);
   req.Start();
   MessageLoop::current()->Run();
   // If the net tests are being run with ChromeFrame then we need to allow for
   // the 'chromeframe' suffix which is added to the user agent before the
   // closing parentheses.
   EXPECT_TRUE(StartsWithASCII(d.data_received(), "Lynx (textmode", true));
 }
 
 }  // namespace net