Convert most remaining resources to use the API/thunk system. The significant

ppapi/proxy/ppb_flash_menu_proxy.cc

 // Copyright (c) 2011 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 165 matching lines @@
     // There was some error, so we won't get a callback. We need to now issue
     // the ACK to the plugin so that it hears about the error. This will also
     // clean up the data associated with the callback.
     callback.Run(result);
   }
 }
 
 void PPB_Flash_Menu_Proxy::OnMsgShowACK(const HostResource& menu,
                                         int32_t selected_id,
                                         int32_t result) {
-  PP_Resource plugin_resource =
-      PluginResourceTracker::GetInstance()->PluginResourceForHostResource(menu);
-  if (!plugin_resource)
+  EnterPluginFromHostResource<PPB_Flash_Menu_API> enter(menu);
+  if (enter.failed())
     return;
-  FlashMenu* object = PluginResource::GetAs<FlashMenu>(plugin_resource);
-  if (!object) {
-    // The plugin has released the FlashMenu object so don't issue the
-    // callback.
-    return;
-  }
-
-  object->ShowACK(selected_id, result);
+  static_cast<FlashMenu*>(enter.object())->ShowACK(selected_id, result);
 }
 
 void PPB_Flash_Menu_Proxy::SendShowACKToPlugin(
     int32_t result,
     ShowRequest* request) {
   dispatcher()->Send(new PpapiMsg_PPBFlashMenu_ShowACK(
       INTERFACE_ID_PPB_FLASH_MENU,
       request->menu,
       request->selected_id,
       result));
   delete request;
 }
 
 }  // namespace proxy
 }  // namespace pp