Add OVERRIDE to chrome/browser/.

chrome/browser/notifications/notification_object_proxy.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_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_
 #pragma once
 
 #include <string>
 
 #include "chrome/browser/notifications/notification_delegate.h"
 
 // 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);
 
   // NotificationDelegate implementation.
-  virtual void Display();
-  virtual void Error();
-  virtual void Close(bool by_user);
-  virtual void Click();
-  virtual std::string id() const;
+  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;
 
  protected:
   friend class base::RefCountedThreadSafe<NotificationObjectProxy>;
 
   virtual ~NotificationObjectProxy() {}
 
  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_