Prefer ScopedNestableTaskAllower over manual save/restore

webkit/tools/test_shell/test_shell_devtools_agent.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 "webkit/tools/test_shell/test_shell_devtools_agent.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "grit/webkit_chromium_resources.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDevToolsAgent.h"
@@ skipping 11 matching lines @@
 namespace {
 
 class WebKitClientMessageLoopImpl
     : public WebKit::WebDevToolsAgentClient::WebKitClientMessageLoop {
  public:
   WebKitClientMessageLoopImpl() : message_loop_(MessageLoop::current()) { }
   virtual ~WebKitClientMessageLoopImpl() {
     message_loop_ = NULL;
   }
   virtual void run() {
-    bool old_state = message_loop_->NestableTasksAllowed();
-    message_loop_->SetNestableTasksAllowed(true);
+    MessageLoop::ScopedNestableTaskAllower allow(message_loop_);
     message_loop_->Run();
-    message_loop_->SetNestableTasksAllowed(old_state);
   }
   virtual void quitNow() {
     message_loop_->QuitNow();
   }
  private:
   MessageLoop* message_loop_;
 };
 
 } //  namespace
 
@@ skipping 71 matching lines @@
 
 bool TestShellDevToolsAgent::evaluateInWebInspector(
       long call_id,
       const std::string& script) {
   WebDevToolsAgent* agent = GetWebAgent();
   if (!agent)
     return false;
   agent->evaluateInWebInspector(call_id, WebString::fromUTF8(script));
   return true;
 }