Bind plugin placeholder directly to v8 instead of over CppBoundClass

components/plugins/renderer/mobile_youtube_plugin.cc

 // 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.
 
 #include "components/plugins/renderer/mobile_youtube_plugin.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
@@ skipping 61 matching lines @@
 
 MobileYouTubePlugin::MobileYouTubePlugin(content::RenderView* render_view,
                                          blink::WebFrame* frame,
                                          const blink::WebPluginParams& params,
                                          base::StringPiece& template_html,
                                          GURL placeholderDataUrl)
     : PluginPlaceholder(render_view,
                         frame,
                         params,
                         HtmlData(params, template_html),
-                        placeholderDataUrl) {}
+                        placeholderDataUrl) {
+  RegisterCallback("openYoutubeURL");
+}
 
 // static
 bool MobileYouTubePlugin::IsYouTubeURL(const GURL& url,
                                        const std::string& mime_type) {
   std::string host = url.host();
   bool is_youtube = EndsWith(host, "youtube.com", true) ||
                     EndsWith(host, "youtube-nocookie.com", true);
 
   return is_youtube && IsValidYouTubeVideo(url.path()) &&
          LowerCaseEqualsASCII(mime_type, content::kFlashPluginSwfMimeType);
 }
 
-void MobileYouTubePlugin::OpenYoutubeUrlCallback(
-    const webkit_glue::CppArgumentList& args,
-    webkit_glue::CppVariant* result) {
+void MobileYouTubePlugin::Observe(const std::string& callback) {
+  DCHECK_EQ("openYoutubeURL", callback);
+
   std::string youtube("vnd.youtube:");
   GURL url(youtube.append(GetYoutubeVideoId(GetPluginParams())));
   WebURLRequest request;
   request.initialize();
   request.setURL(url);
   render_view()->LoadURLExternally(
       GetFrame(), request, blink::WebNavigationPolicyNewForegroundTab);
 }
-void MobileYouTubePlugin::BindWebFrame(WebFrame* frame) {
-  PluginPlaceholder::BindWebFrame(frame);
-  BindCallback("openYoutubeURL",
-               base::Bind(&MobileYouTubePlugin::OpenYoutubeUrlCallback,
-                          base::Unretained(this)));
-}
 
 }  // namespace plugins