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

chrome/browser/dom_ui/downloads_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/dom_ui/downloads_ui.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
+#include "base/singleton.h"
 #include "base/string_piece.h"
 #include "base/thread.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/dom_ui/chrome_url_data_manager.h"
 #include "chrome/browser/dom_ui/downloads_dom_handler.h"
 #include "chrome/browser/download/download_manager.h"
 #include "chrome/browser/profile.h"
 #include "chrome/common/jstemplate_builder.h"
 #include "chrome/common/url_constants.h"
@@ skipping 108 matching lines @@
   DownloadsDOMHandler* handler = new DownloadsDOMHandler(dlm);
   AddMessageHandler(handler);
   handler->Attach(this);
   handler->Init();
 
   DownloadsUIHTMLSource* html_source = new DownloadsUIHTMLSource();
 
   // Set up the chrome://downloads/ source.
   ChromeThread::PostTask(
       ChromeThread::IO, FROM_HERE,
-      NewRunnableMethod(&chrome_url_data_manager,
+      NewRunnableMethod(Singleton<ChromeURLDataManager>().get(),
           &ChromeURLDataManager::AddDataSource,
           html_source));
 }
 
 // static
 RefCountedMemory* DownloadsUI::GetFaviconResourceBytes() {
   return ResourceBundle::GetSharedInstance().
       LoadImageResourceBytes(IDR_DOWNLOADS_FAVICON);
 }