Plugin Placeholders: Factor out common BindWebFrame method into base class.

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 {
@@ skipping 13 matching lines @@
 
   // Whether this is a youtube url.
   static bool IsYouTubeURL(const GURL& url, const std::string& mime_type);
 
  private:
   ~MobileYouTubePlugin() override;
 
   // Opens a youtube app in the current tab.
   void OpenYoutubeUrlCallback();
 
-  // WebViewPlugin::Delegate (via PluginPlaceholder) method
-  void BindWebFrame(blink::WebFrame* frame) override;
-
   // gin::Wrappable (via PluginPlaceholder) method
   gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
       v8::Isolate* isolate) override;
 
   DISALLOW_COPY_AND_ASSIGN(MobileYouTubePlugin);
 };
 
 }  // namespace plugins
 
 #endif  // COMPONENTS_PLUGINS_RENDERER_MOBILE_YOUTUBE_PLUGIN_H_