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

chrome/browser/extensions/extensions_ui.cc

 // Copyright (c) 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/extensions/extensions_ui.h"
 
 #include <algorithm>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 925 matching lines @@
   ExtensionsDOMHandler* handler = new ExtensionsDOMHandler(exstension_service);
   AddMessageHandler(handler);
   handler->Attach(this);
 
   ExtensionsUIHTMLSource* html_source = new ExtensionsUIHTMLSource();
 
   // Set up the chrome://extensions/ source.
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(html_source)));
 }
 
 // static
 RefCountedMemory* ExtensionsUI::GetFaviconResourceBytes() {
   return ResourceBundle::GetSharedInstance().
       LoadDataResourceBytes(IDR_PLUGIN);
 }
 
 // static
 void ExtensionsUI::RegisterUserPrefs(PrefService* prefs) {
   prefs->RegisterBooleanPref(prefs::kExtensionsUIDeveloperMode, false);
 }