Remove unnecessary image downloading handler of notifications.

chrome/browser/notifications/notification_object_proxy.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 CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 16 matching lines @@
   NotificationObjectProxy(
       content::RenderFrameHost* render_frame_host,
       scoped_ptr<content::DesktopNotificationDelegate> delegate);
 
   // NotificationDelegate implementation.
   virtual void Display() OVERRIDE;
   virtual void Error() OVERRIDE;
   virtual void Close(bool by_user) OVERRIDE;
   virtual void Click() OVERRIDE;
   virtual std::string id() const OVERRIDE;
-  virtual content::WebContents* GetWebContents() const OVERRIDE;
 
  protected:
   friend class base::RefCountedThreadSafe<NotificationObjectProxy>;
 
   virtual ~NotificationObjectProxy();
 
  private:
   // Callback information to find the JS Notification object where it lives.
   int render_process_id_;
   int render_frame_id_;
   scoped_ptr<content::DesktopNotificationDelegate> delegate_;
   bool displayed_;
   std::string id_;
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_