PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_flash_menu_thunk.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/c/private/ppb_flash_menu.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/thunk.h"
 #include "ppapi/thunk/ppb_flash_menu_api.h"
@@ skipping 16 matching lines @@
   return PP_FromBool(enter.succeeded());
 }
 
 int32_t Show(PP_Resource resource,
              const PP_Point* location,
              int32_t* selected_id,
              PP_CompletionCallback callback) {
   EnterResource<PPB_Flash_Menu_API> enter(resource, callback, true);
   if (enter.failed())
     return enter.retval();
-  return enter.SetResult(enter.object()->Show(location, selected_id, callback));
+  return enter.SetResult(enter.object()->Show(location, selected_id,
+                                              enter.callback()));
 }
 
 const PPB_Flash_Menu g_ppb_flash_menu_thunk = {
   &Create,
   &IsFlashMenu,
   &Show
 };
 
 }  // namespace
 
 const PPB_Flash_Menu_0_2* GetPPB_Flash_Menu_0_2_Thunk() {
   return &g_ppb_flash_menu_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi