Convert chrome_url_data_manager (previously a global) into a Singleton. This

chrome/browser/extensions/extensions_ui.cc

 // Copyright (c) 2006-2009 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 "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/string_util.h"
 #include "base/thread.h"
@@ skipping 540 matching lines @@
   ExtensionsDOMHandler* handler = new ExtensionsDOMHandler(exstension_service);
   AddMessageHandler(handler);
   handler->Attach(this);
 
   ExtensionsUIHTMLSource* html_source = new ExtensionsUIHTMLSource();
 
   // Set up the chrome://extensions/ source.
   ChromeThread::PostTask(
       ChromeThread::IO, FROM_HERE,
       NewRunnableMethod(
-          &chrome_url_data_manager, &ChromeURLDataManager::AddDataSource,
+          Singleton<ChromeURLDataManager>().get(),
+          &ChromeURLDataManager::AddDataSource,
           html_source));
 }
 
 // static
 RefCountedMemory* ExtensionsUI::GetFaviconResourceBytes() {
   return ResourceBundle::GetSharedInstance().
       LoadImageResourceBytes(IDR_PLUGIN);
 }
 
 // static
 void ExtensionsUI::RegisterUserPrefs(PrefService* prefs) {
   prefs->RegisterBooleanPref(prefs::kExtensionsUIDeveloperMode, false);
 }