Eliminated the last few uses of MessageLoop::QuitTask in chrome/

chrome/test/base/testing_profile.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 "chrome/test/base/testing_profile.h"
 
 #include "build/build_config.h"
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
@@ skipping 241 matching lines @@
   }
   history_service_ = new HistoryService(this);
   history_service_->Init(GetPath(), bookmark_bar_model_.get(), no_db);
 }
 
 void TestingProfile::DestroyHistoryService() {
   if (!history_service_.get())
     return;
 
   history_service_->NotifyRenderProcessHostDestruction(0);
-  history_service_->SetOnBackendDestroyTask(new MessageLoop::QuitTask);
+  history_service_->SetOnBackendDestroyTask(MessageLoop::QuitClosure());
   history_service_->Cleanup();
   history_service_ = NULL;
 
   // Wait for the backend class to terminate before deleting the files and
   // moving to the next test. Note: if this never terminates, somebody is
   // probably leaking a reference to the history backend, so it never calls
   // our destroy task.
   MessageLoop::current()->Run();
 
   // Make sure we don't have any event pending that could disrupt the next
   // test.
-  MessageLoop::current()->PostTask(FROM_HERE, new MessageLoop::QuitTask);
+  MessageLoop::current()->PostTask(FROM_HERE, MessageLoop::QuitClosure());
   MessageLoop::current()->Run();
 }
 
 void TestingProfile::CreateTopSites() {
   DestroyTopSites();
   top_sites_ = new history::TopSites(this);
   FilePath file_name = GetPath().Append(chrome::kTopSitesFilename);
   top_sites_->Init(file_name);
 }
 
@@ skipping 571 matching lines @@
 quota::SpecialStoragePolicy* TestingProfile::GetSpecialStoragePolicy() {
   return GetExtensionSpecialStoragePolicy();
 }
 
 void TestingProfile::DestroyWebDataService() {
   if (!web_data_service_.get())
     return;
 
   web_data_service_->Shutdown();
 }