Standardize usage of virtual/override/final in components/

components/plugins/renderer/mobile_youtube_plugin.h

 // Copyright 2013 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 COMPONENTS_PLUGINS_RENDERER_MOBILE_YOUTUBE_PLUGIN_H_
 #define COMPONENTS_PLUGINS_RENDERER_MOBILE_YOUTUBE_PLUGIN_H_
 
 #include "components/plugins/renderer/plugin_placeholder.h"
 
 namespace plugins {
 
 // Class representing placeholders for old style embedded youtube video on
 // mobile device. For old style embedded youtube video, it has a url in the form
 // of http://www.youtube.com/v/VIDEO_ID. This placeholder replaces the url with
 // a simple html page and clicking the play image redirects the user to the
 // mobile youtube app.
 class MobileYouTubePlugin : public PluginPlaceholder {
  public:
   MobileYouTubePlugin(content::RenderFrame* render_frame,
                       blink::WebLocalFrame* frame,
                       const blink::WebPluginParams& params,
                       base::StringPiece& template_html,
                       GURL placeholderDataUrl);
 
   // Whether this is a youtube url.
   static bool IsYouTubeURL(const GURL& url, const std::string& mime_type);
 
  private:
-  virtual ~MobileYouTubePlugin();
+  ~MobileYouTubePlugin() override;
 
   // Opens a youtube app in the current tab.
   void OpenYoutubeUrlCallback();
 
   // WebViewPlugin::Delegate (via PluginPlaceholder) method
-  virtual void BindWebFrame(blink::WebFrame* frame) override;
+  void BindWebFrame(blink::WebFrame* frame) override;
 
   // gin::Wrappable (via PluginPlaceholder) method
-  virtual gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
+  gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
       v8::Isolate* isolate) override;
 
   DISALLOW_COPY_AND_ASSIGN(MobileYouTubePlugin);
 };
 
 }  // namespace plugins
 
 #endif  // COMPONENTS_PLUGINS_RENDERER_MOBILE_YOUTUBE_PLUGIN_H_