Use HttpRequestHeaders for extra_headers.

net/http/http_network_layer_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/base/mock_host_resolver.h"
 #include "net/base/net_log.h"
 #include "net/base/ssl_config_service_defaults.h"
 #include "net/http/http_network_layer.h"
 #include "net/http/http_transaction_unittest.h"
 #include "net/proxy/proxy_service.h"
@@ skipping 64 matching lines @@
 
   TestCompletionCallback callback;
 
   scoped_ptr<net::HttpTransaction> trans;
   int rv = factory.CreateTransaction(&trans);
   EXPECT_EQ(net::OK, rv);
 
   net::HttpRequestInfo request_info;
   request_info.url = GURL("http://www.google.com/");
   request_info.method = "GET";
-  request_info.user_agent = "Foo/1.0";
+  request_info.extra_headers.SetHeader(net::HttpRequestHeaders::kUserAgent,
+                                       "Foo/1.0");
   request_info.load_flags = net::LOAD_NORMAL;
 
   rv = trans->Start(&request_info, &callback, net::BoundNetLog());
   if (rv == net::ERR_IO_PENDING)
     rv = callback.WaitForResult();
   ASSERT_EQ(net::OK, rv);
 
   std::string contents;
   rv = ReadTransaction(trans.get(), &contents);
   EXPECT_EQ(net::OK, rv);
   EXPECT_EQ("hello world", contents);
 }