Bind plugin placeholder directly to v8 instead of over CppBoundClass

components/plugins/renderer/mobile_youtube_plugin.cc

Index: components/plugins/renderer/mobile_youtube_plugin.cc
diff --git a/components/plugins/renderer/mobile_youtube_plugin.cc b/components/plugins/renderer/mobile_youtube_plugin.cc
index e2f5793e790e4dc55fcd2331828186d90964178a..b65c7e45afa0a66fffde0b48e5f8a26a36a1059c 100644
--- a/components/plugins/renderer/mobile_youtube_plugin.cc
+++ b/components/plugins/renderer/mobile_youtube_plugin.cc
@@ -79,7 +79,9 @@ MobileYouTubePlugin::MobileYouTubePlugin(content::RenderView* render_view,
                         frame,
                         params,
                         HtmlData(params, template_html),
-                        placeholderDataUrl) {}
+                        placeholderDataUrl) {
+  RegisterCallback("openYoutubeURL");
+}
 
 // static
 bool MobileYouTubePlugin::IsYouTubeURL(const GURL& url,
@@ -92,9 +94,9 @@ bool MobileYouTubePlugin::IsYouTubeURL(const GURL& url,
          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;
@@ -103,11 +105,5 @@ void MobileYouTubePlugin::OpenYoutubeUrlCallback(
   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