Remove BrowserThread::UnsafeGetBrowserThread, add UnsafeGetMessageLoopForThread.

chrome/browser/net/chrome_url_request_context.h

 // Copyright (c) 2011 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 CHROME_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_
 #define CHROME_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 164 matching lines @@
   void OnAcceptLanguageChange(const std::string& accept_language);
   void OnDefaultCharsetChange(const std::string& default_charset);
   void OnClearSiteDataOnExitChange(bool clear_site_data);
 
   // Saves the cookie store to |result| and signals |completion|.
   void GetCookieStoreAsyncHelper(base::WaitableEvent* completion,
                                  net::CookieStore** result);
 
   PrefChangeRegistrar registrar_;
 
-  // |io_thread_| is always valid during the lifetime of |this| since |this| is
-  // deleted on the IO thread.
-  IOThread* const io_thread_;
-
   // Deferred logic for creating a ChromeURLRequestContext.
   // Access only from the IO thread.
   scoped_ptr<ChromeURLRequestContextFactory> factory_;
 
   // NULL if not yet initialized. Otherwise, it is the net::URLRequestContext
   // instance that was lazily created by GetURLRequestContext().
   // Access only from the IO thread.
   base::WeakPtr<net::URLRequestContext> url_request_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeURLRequestContextGetter);
 };
 
 #endif  // CHROME_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_