Do not override User-Agent header added by WebCore

net/url_request/url_request_unittest.cc

 // Copyright (c) 2010 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 "net/url_request/url_request_unittest.h"
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <shlobj.h>
@@ skipping 2624 matching lines @@
   TestURLRequest
       req(test_server_.GetURL("echoheaderoverride?Accept-Charset"), &d);
   req.set_context(new TestURLRequestContext());
   net::HttpRequestHeaders headers;
   headers.SetHeader(net::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;
+  TestURLRequest req(test_server_.GetURL("echoheader?User-Agent"), &d);
+  req.set_context(new TestURLRequestContext());
+  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;
+  TestURLRequest
+      req(test_server_.GetURL("echoheaderoverride?User-Agent"), &d);
+  req.set_context(new TestURLRequestContext());
+  net::HttpRequestHeaders headers;
+  headers.SetHeader(net::HttpRequestHeaders::kUserAgent, "Lynx (textmode)");
+  req.SetExtraRequestHeaders(headers);
+  req.Start();
+  MessageLoop::current()->Run();
+  EXPECT_EQ(std::string("Lynx (textmode)"), d.data_received());
+}