Add a new GetInstance() method for singleton classes used in chrome/browser files.

chrome/browser/chromeos/dom_ui/mobile_setup_ui.cc

 // Copyright (c) 2006-2010 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/browser/chromeos/dom_ui/mobile_setup_ui.h"
 
 #include <algorithm>
 #include <map>
 #include <string>
 
@@ skipping 1017 matching lines @@
   MobileSetupHandler* handler = new MobileSetupHandler(service_path);
   AddMessageHandler((handler)->Attach(this));
   handler->Init(contents);
   MobileSetupUIHTMLSource* html_source =
       new MobileSetupUIHTMLSource(service_path);
 
   // Set up the chrome://mobilesetup/ source.
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(html_source)));
 }