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

chrome/browser/notifications/notification_object_proxy.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_
 #pragma once
 
 #include <string>
 
 #include "chrome/browser/notifications/notification_delegate.h"
 
-class MessageLoop;
-namespace IPC {
-class Message;
-}
-
 // A NotificationObjectProxy stands in for the JavaScript Notification object
 // which corresponds to a notification toast on the desktop.  It can be signaled
 // when various events occur regarding the desktop notification, and the
 // attached JS listeners will be invoked in the renderer or worker process.
 class NotificationObjectProxy
     : public NotificationDelegate {
  public:
   // Creates a Proxy object with the necessary callback information.
   NotificationObjectProxy(int process_id, int route_id,
                           int notification_id, bool worker);
@@ skipping 12 matching lines @@
 
  private:
   // Callback information to find the JS Notification object where it lives.
   int process_id_;
   int route_id_;
   int notification_id_;
   bool worker_;
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_