Prefer ScopedNestableTaskAllower over manual save/restore

content/renderer/devtools_agent.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 "content/renderer/devtools_agent.h"
 
 #include <map>
 
 #include "base/lazy_instance.h"
 #include "base/message_loop.h"
@@ skipping 20 matching lines @@
 namespace {
 
 class WebKitClientMessageLoopImpl
     : public 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_;
 };
 
 typedef std::map<int, DevToolsAgent*> IdToAgentMap;
 base::LazyInstance<IdToAgentMap>::Leaky
@@ skipping 124 matching lines @@
 WebDevToolsAgent* DevToolsAgent::GetWebAgent() {
   WebView* web_view = render_view()->GetWebView();
   if (!web_view)
     return NULL;
   return web_view->devToolsAgent();
 }
 
 bool DevToolsAgent::IsAttached() {
   return is_attached_;
 }