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

chrome/browser/dom_ui/downloads_dom_handler.cc

 // Copyright (c) 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_dom_handler.h"
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/singleton.h"
 #include "base/string_piece.h"
@@ skipping 34 matching lines @@
 } // namespace
 
 DownloadsDOMHandler::DownloadsDOMHandler(DownloadManager* dlm)
     : search_text_(),
       download_manager_(dlm),
       callback_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
   // Create our fileicon data source.
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       NewRunnableMethod(
-          Singleton<ChromeURLDataManager>::get(),
+          ChromeURLDataManager::GetInstance(),
           &ChromeURLDataManager::AddDataSource,
           make_scoped_refptr(new FileIconSource())));
 }
 
 DownloadsDOMHandler::~DownloadsDOMHandler() {
   ClearDownloadItems();
   download_manager_->RemoveObserver(this);
 }
 
 // DownloadsDOMHandler, public: -----------------------------------------------
@@ skipping 175 matching lines @@
   return NULL;
 }
 
 DownloadItem* DownloadsDOMHandler::GetDownloadByValue(const ListValue* args) {
   int id;
   if (ExtractIntegerValue(args, &id)) {
     return GetDownloadById(id);
   }
   return NULL;
 }