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

content/common/net/url_fetcher_impl_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 "content/common/net/url_fetcher_impl.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/file_util.h"
@@ skipping 20 matching lines @@
 
 // TODO(eroman): Add a regression test for http://crbug.com/40505.
 
 namespace {
 
 const FilePath::CharType kDocRoot[] = FILE_PATH_LITERAL("chrome/test/data");
 const char kTestServerFilePrefix[] = "files/";
 
 class ThrottlingTestURLRequestContext : public TestURLRequestContext {
  public:
-  ThrottlingTestURLRequestContext() : TestURLRequestContext(true) {
+  ThrottlingTestURLRequestContext()
+      : TestURLRequestContext(true),
+        throttler_manager_(&delegate_) {
     set_throttler_manager(&throttler_manager_);
     Init();
     DCHECK(throttler_manager() != NULL);
   }
 
  private:
+  TestURLRequestThrottlerManagerDelegate delegate_;
   net::URLRequestThrottlerManager throttler_manager_;
 };
 
 class ThrottlingTestURLRequestContextGetter
     : public TestURLRequestContextGetter {
  public:
   ThrottlingTestURLRequestContextGetter(
       base::MessageLoopProxy* io_message_loop_proxy,
       TestURLRequestContext* request_context)
       : TestURLRequestContextGetter(io_message_loop_proxy),
@@ skipping 1088 matching lines @@
       std::string(kTestServerFilePrefix) + kFileToFetch));
 
   MessageLoop::current()->Run();  // OnURLFetchComplete() will Quit().
 
   MessageLoop::current()->RunAllPending();
   ASSERT_FALSE(file_util::PathExists(file_path_))
       << file_path_.value() << " not removed.";
 }
 
 }  // namespace.