Prefer ScopedNestableTaskAllower over manual save/restore

webkit/plugins/ppapi/ppb_flash_impl.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 "webkit/plugins/ppapi/ppb_flash_impl.h"
 
 #include <string>
 #include <vector>
 
 #include "base/message_loop.h"
@@ skipping 181 matching lines @@
                                    PP_ToBool(from_user_action));
 }
 
 int32_t Navigate11(PP_Resource request_id,
                    const char* target,
                    bool from_user_action) {
   return Navigate(request_id, target, PP_FromBool(from_user_action));
 }
 
 void RunMessageLoop(PP_Instance instance) {
-  bool old_state = MessageLoop::current()->NestableTasksAllowed();
-  MessageLoop::current()->SetNestableTasksAllowed(true);
+  MessageLoop::ScopedNestableTaskAllower allow(MessageLoop::current());
   MessageLoop::current()->Run();
-  MessageLoop::current()->SetNestableTasksAllowed(old_state);
 }
 
 void QuitMessageLoop(PP_Instance instance) {
   MessageLoop::current()->QuitNow();
 }
 
 double GetLocalTimeZoneOffset(PP_Instance pp_instance, PP_Time t) {
   PluginInstance* instance = HostGlobals::Get()->GetInstance(pp_instance);
   if (!instance)
     return 0.0;
@@ skipping 58 matching lines @@
   return &ppb_flash_11;
 }
 
 // static
 const PPB_Flash_12_0* PPB_Flash_Impl::GetInterface12_0() {
   return &ppb_flash_12;
 }
 
 }  // namespace ppapi
 }  // namespace webkit