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

chrome/browser/dom_ui/slideshow_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/dom_ui/slideshow_ui.h"
 
 #include "app/resource_bundle.h"
 #include "base/callback.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
@@ skipping 135 matching lines @@
     lister_->Cancel();
     lister_->set_delegate(NULL);
   }
 }
 
 DOMMessageHandler* SlideshowHandler::Attach(DOMUI* dom_ui) {
   // Create our favicon data source.
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(new DOMUIFavIconSource(dom_ui->GetProfile()))));
   profile_ = dom_ui->GetProfile();
   return DOMMessageHandler::Attach(dom_ui);
 }
 
 void SlideshowHandler::Init() {
 }
 
 void SlideshowHandler::RegisterMessages() {
@@ skipping 114 matching lines @@
 SlideshowUI::SlideshowUI(TabContents* contents) : DOMUI(contents) {
   SlideshowHandler* handler = new SlideshowHandler();
   AddMessageHandler((handler)->Attach(this));
   handler->Init();
   SlideshowUIHTMLSource* html_source = new SlideshowUIHTMLSource();
 
   // Set up the chrome://slideshow/ source.
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(html_source)));
 }