Move the plugin placeholder from CppBoundClass to gin::Wrappable

chrome/renderer/plugins/chrome_plugin_placeholder.h

Index: chrome/renderer/plugins/chrome_plugin_placeholder.h
diff --git a/chrome/renderer/plugins/chrome_plugin_placeholder.h b/chrome/renderer/plugins/chrome_plugin_placeholder.h
index 66869207a28f81c431a7ffb40d04b4af6a1ec222..1dac496d0e2df2880724fabd6b237efadb4e4258 100644
--- a/chrome/renderer/plugins/chrome_plugin_placeholder.h
+++ b/chrome/renderer/plugins/chrome_plugin_placeholder.h
@@ -6,13 +6,18 @@
 #define CHROME_RENDERER_PLUGINS_CHROME_PLUGIN_PLACEHOLDER_H_
 
 #include "components/plugins/renderer/plugin_placeholder.h"
+#include "gin/wrappable.h"
 
 struct ChromeViewHostMsg_GetPluginInfo_Status;
 
 class ChromePluginPlaceholder : public plugins::PluginPlaceholder,
                                 public content::RenderProcessObserver,
-                                public content::ContextMenuClient {
+                                public content::ContextMenuClient,
+                                public gin::Wrappable<ChromePluginPlaceholder> {
  public:
+  static gin::WrapperInfo kWrapperInfo;
+  static v8::Local<v8::ObjectTemplate> GetObjectTemplate(v8::Isolate* isolate);
+
   static const char kPluginPlaceholderDataURL[];
 
   static ChromePluginPlaceholder* CreateBlockedPlugin(
@@ -66,9 +71,7 @@ class ChromePluginPlaceholder : public plugins::PluginPlaceholder,
   virtual void OnMenuClosed(int request_id) OVERRIDE;
 
   // Javascript callback opens chrome://plugins in a new tab.
-  // Arguments are required by the caller, but not used.
-  void OpenAboutPluginsCallback(const webkit_glue::CppArgumentList& args,
-                                webkit_glue::CppVariant* result);
+  void OpenAboutPluginsCallback();
 
   void OnLoadBlockedPlugins(const std::string& identifier);
   void OnSetIsPrerendering(bool is_prerendering);