Introduce a delegate to avoid hardcoding "chrome-extension" in net/.

net/url_request/url_request_test_util.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 "net/url_request/url_request_test_util.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/threading/thread.h"
@@ skipping 104 matching lines @@
 TestURLRequest::TestURLRequest(const GURL& url, Delegate* delegate)
     : net::URLRequest(url, delegate),
       context_(new TestURLRequestContext) {
   set_context(context_.get());
 }
 
 TestURLRequest::~TestURLRequest() {
   set_context(NULL);
 }
 
+bool TestURLRequestThrottlerManagerDelegate::MayRejectRequest(
+    net::URLRequest* request) {
+  return true;
+}
+
 TestURLRequestContextGetter::TestURLRequestContextGetter(
     const scoped_refptr<base::MessageLoopProxy>& io_message_loop_proxy)
     : io_message_loop_proxy_(io_message_loop_proxy) {
   DCHECK(io_message_loop_proxy.get());
 }
 
 TestURLRequestContextGetter::TestURLRequestContextGetter(
     const scoped_refptr<base::MessageLoopProxy>& io_message_loop_proxy,
     scoped_ptr<TestURLRequestContext> context)
     : io_message_loop_proxy_(io_message_loop_proxy), context_(context.Pass()) {
@@ skipping 370 matching lines @@
 
 ScopedCustomUrlRequestTestHttpHost::~ScopedCustomUrlRequestTestHttpHost() {
   DCHECK_EQ(value_, new_value_);
   value_ = old_value_;
 }
 
 // static
 const std::string& ScopedCustomUrlRequestTestHttpHost::value() {
   return value_;
 }