Standardize usage of virtual/override/final in content/renderer/

content/renderer/web_ui_extension_data.h

 // Copyright 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 CONTENT_RENDERER_WEB_UI_EXTENSION_DATA_H_
 #define CONTENT_RENDERER_WEB_UI_EXTENSION_DATA_H_
 
 #include <map>
 #include <string>
 
 #include "base/basictypes.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "content/public/renderer/render_view_observer_tracker.h"
 
 namespace content {
 
 class WebUIExtensionData
     : public RenderViewObserver,
       public RenderViewObserverTracker<WebUIExtensionData> {
  public:
   explicit WebUIExtensionData(RenderView* render_view);
-  virtual ~WebUIExtensionData();
+  ~WebUIExtensionData() override;
 
   // Returns value for a given |key|. Will return an empty string if no such key
   // exists in the |variable_map_|.
   std::string GetValue(const std::string& key) const;
 
  private:
   // RenderViewObserver implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   void OnSetWebUIProperty(const std::string& name, const std::string& value);
 
   std::map<std::string, std::string> variable_map_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(WebUIExtensionData);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_WEB_UI_EXTENSION_DATA_H_