Cleanup: Remove unneeded forward declarations from various chrome/browser subdirectories.

chrome/browser/renderer_host/offline_resource_handler.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_RENDERER_HOST_OFFLINE_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_OFFLINE_RESOURCE_HANDLER_H_
 #pragma once
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/chromeos/offline/offline_load_page.h"
 #include "content/browser/renderer_host/resource_handler.h"
 #include "net/base/completion_callback.h"
 
 class ChromeAppCacheService;
-class MessageLoop;
 class ResourceDispatcherHost;
 
 namespace net {
 class URLRequest;
 }  // namespace net
 
 // Used to show an offline interstitial page when the network is not available.
 class OfflineResourceHandler : public ResourceHandler {
  public:
   OfflineResourceHandler(ResourceHandler* handler,
@@ skipping 53 matching lines @@
   int deferred_request_id_;
   GURL deferred_url_;
 
   scoped_refptr<net::CancelableOldCompletionCallback<OfflineResourceHandler> >
       appcache_completion_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflineResourceHandler);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_OFFLINE_RESOURCE_HANDLER_H_