Support using TrackedCallbacks as hints to determine the handling thread of resource reply messages

ppapi/proxy/plugin_dispatcher.h

Index: ppapi/proxy/plugin_dispatcher.h
diff --git a/ppapi/proxy/plugin_dispatcher.h b/ppapi/proxy/plugin_dispatcher.h
index 3a9e7330865e4d3fae4428c11de747f7b4ac1012..d13d44c9c0617d78c3d3efe168693cb9e802f8e1 100644
--- a/ppapi/proxy/plugin_dispatcher.h
+++ b/ppapi/proxy/plugin_dispatcher.h
@@ -163,13 +163,6 @@ class PPAPI_PROXY_EXPORT PluginDispatcher
   uint32 plugin_dispatcher_id() const { return plugin_dispatcher_id_; }
   bool incognito() const { return incognito_; }
 
-  // Dispatches the given resource message to the appropriate resource in the
-  // plugin process. This should be wired to the various channels that messages
-  // come in from various other processes.
-  static void DispatchResourceReply(
-      const ppapi::proxy::ResourceMessageReplyParams& reply_params,
-      const IPC::Message& nested_msg);
-
  private:
   friend class PluginDispatcherTest;
 
@@ -178,17 +171,9 @@ class PPAPI_PROXY_EXPORT PluginDispatcher
   void ForceFreeAllInstances();
 
   // IPC message handlers.
-  void OnMsgResourceReply(
-      const ppapi::proxy::ResourceMessageReplyParams& reply_params,
-      const IPC::Message& nested_msg);
   void OnMsgSupportsInterface(const std::string& interface_name, bool* result);
   void OnMsgSetPreferences(const Preferences& prefs);
 
-  // Internal backed for DispatchResourceReply.
-  static void LockedDispatchResourceReply(
-      const ppapi::proxy::ResourceMessageReplyParams& reply_params,
-      const IPC::Message& nested_msg);
-
   virtual bool SendMessage(IPC::Message* msg);
 
   PluginDelegate* plugin_delegate_;