Standardize usage of virtual/override/final in chrome/browser/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 10 matching lines @@
 // 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. The Proxy
   // will take ownership of |delegate|.
   NotificationObjectProxy(
       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;
+  void Display() override;
+  void Error() override;
+  void Close(bool by_user) override;
+  void Click() override;
+  std::string id() const override;
 
  protected:
   friend class base::RefCountedThreadSafe<NotificationObjectProxy>;
 
-  virtual ~NotificationObjectProxy();
+  ~NotificationObjectProxy() override;
 
  private:
   scoped_ptr<content::DesktopNotificationDelegate> delegate_;
   bool displayed_;
   std::string id_;
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_OBJECT_PROXY_H_