Remove direct usage of BrowserThreadImpl in tests

net/url_request/test_url_fetcher_factory.h

 // 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.
 
 #ifndef NET_URL_REQUEST_TEST_URL_FETCHER_FACTORY_H_
 #define NET_URL_REQUEST_TEST_URL_FETCHER_FACTORY_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 27 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(ScopedURLFetcherFactory);
 };
 
 // TestURLFetcher and TestURLFetcherFactory are used for testing consumers of
 // URLFetcher. TestURLFetcherFactory is a URLFetcherFactory that creates
 // TestURLFetchers. TestURLFetcher::Start is overriden to do nothing. It is
 // expected that you'll grab the delegate from the TestURLFetcher and invoke
 // the callback method when appropriate. In this way it's easy to mock a
 // URLFetcher.
 // Typical usage:
-//   // TestURLFetcher requires a MessageLoop.
-//   MessageLoop message_loop;
-//   // And an IO thread to release URLRequestContextGetter in URLFetcher::Core.
-//   BrowserThreadImpl io_thread(BrowserThread::IO, &message_loop);
+//   // TestURLFetcher requires a MessageLoop and an IO thread to release
+//   // URLRequestContextGetter in URLFetcher::Core.
+//   TestBrowserThreadBundle thread_bundle_;
 //   // Create factory (it automatically sets itself as URLFetcher's factory).
 //   TestURLFetcherFactory factory;
 //   // Do something that triggers creation of a URLFetcher.
 //   ...
 //   TestURLFetcher* fetcher = factory.GetFetcherByID(expected_id);
 //   DCHECK(fetcher);
 //   // Notify delegate with whatever data you want.
 //   fetcher->delegate()->OnURLFetchComplete(...);
 //   // Make sure consumer of URLFetcher does the right thing.
 //   ...
@@ skipping 407 matching lines @@
   std::unique_ptr<URLFetcher> CreateURLFetcher(
       int id,
       const GURL& url,
       URLFetcher::RequestType request_type,
       URLFetcherDelegate* d) override;
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_TEST_URL_FETCHER_FACTORY_H_