PPAPI: Get TrackedCallback ready for running on non-main threads.

ppapi/proxy/ppb_flash_menu_proxy.cc

 // Copyright (c) 2012 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 "ppapi/proxy/ppb_flash_menu_proxy.h"
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/private/ppb_flash_menu.h"
 #include "ppapi/proxy/enter_proxy.h"
 #include "ppapi/proxy/ppapi_messages.h"
@@ skipping 52 matching lines @@
   callback_ = callback;
 
   PluginDispatcher::GetForResource(this)->Send(
       new PpapiHostMsg_PPBFlashMenu_Show(
           API_ID_PPB_FLASH_MENU, host_resource(), *location));
   return PP_OK_COMPLETIONPENDING;
 }
 
 void FlashMenu::ShowACK(int32_t selected_id, int32_t result) {
   *selected_id_ptr_ = selected_id;
-  TrackedCallback::ClearAndRun(&callback_, result);
+  callback_->Run(result);
 }
 
 PPB_Flash_Menu_Proxy::PPB_Flash_Menu_Proxy(Dispatcher* dispatcher)
     : InterfaceProxy(dispatcher),
       callback_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
 }
 
 PPB_Flash_Menu_Proxy::~PPB_Flash_Menu_Proxy() {
 }
 
@@ skipping 81 matching lines @@
   dispatcher()->Send(new PpapiMsg_PPBFlashMenu_ShowACK(
       API_ID_PPB_FLASH_MENU,
       request->menu,
       request->selected_id,
       result));
   delete request;
 }
 
 }  // namespace proxy
 }  // namespace ppapi