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

chrome/service/cloud_print/cloud_print_url_fetcher_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 "base/command_line.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop_proxy.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "base/values.h"
@@ skipping 44 matching lines @@
  private:
   // Not owned here.
   net::URLRequestThrottlerManager* throttler_manager_;
   scoped_ptr<TestURLRequestContext> context_;
 };
 
 class TestCloudPrintURLFetcher : public CloudPrintURLFetcher {
  public:
   explicit TestCloudPrintURLFetcher(
       base::MessageLoopProxy* io_message_loop_proxy)
-      : io_message_loop_proxy_(io_message_loop_proxy) {
+      : io_message_loop_proxy_(io_message_loop_proxy),
+        throttler_manager_(&throttler_delegate_){
   }
 
   virtual net::URLRequestContextGetter* GetRequestContextGetter() {
     return new TrackingTestURLRequestContextGetter(
         io_message_loop_proxy_.get(), throttler_manager());
   }
 
   net::URLRequestThrottlerManager* throttler_manager() {
     return &throttler_manager_;
   }
 
  private:
   virtual ~TestCloudPrintURLFetcher() {}
 
   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 
+  TestURLRequestThrottlerManagerDelegate throttler_delegate_;
+
   // We set this as the throttler manager for the
   // TestURLRequestContext we create.
   net::URLRequestThrottlerManager throttler_manager_;
 };
 
 class CloudPrintURLFetcherTest : public testing::Test,
                                  public CloudPrintURLFetcherDelegate {
  public:
   CloudPrintURLFetcherTest() : max_retries_(0), fetcher_(NULL) { }
 
@@ skipping 277 matching lines @@
                               FilePath(kDocRoot));
   ASSERT_TRUE(test_server.Start());
 
   GURL url(test_server.GetURL("defaultresponse"));
   CreateFetcher(url, 11);
 
   MessageLoop::current()->Run();
 }
 
 }  // namespace.