Remove DeleteTask and convert remaining users.

chrome/browser/extensions/extension_data_deleter.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_DATA_DELETER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_DATA_DELETER_H_
 #pragma once
 
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
+#include "base/message_loop_helpers.h"
 #include "base/string16.h"
 #include "content/public/browser/browser_thread.h"
 #include "googleurl/src/gurl.h"
 
 namespace webkit_database {
 class DatabaseTracker;
 }
 
 namespace fileapi {
 class FileSystemContext;
@@ skipping 20 matching lines @@
   // threads, respectively. This function must be called from the UI thread.
   static void StartDeleting(
       Profile* profile,
       const std::string& extension_id,
       const GURL& storage_origin,
       bool is_storage_isolated);
 
  private:
   friend struct content::BrowserThread::DeleteOnThread<
       content::BrowserThread::UI>;
-  friend class DeleteTask<ExtensionDataDeleter>;
+  friend class base::DeleteHelper<ExtensionDataDeleter>;
 
   ExtensionDataDeleter(
       Profile* profile,
       const std::string& extension_id,
       const GURL& storage_origin,
       bool is_storage_isolated);
   ~ExtensionDataDeleter();
 
   // Deletes the cookies for the extension. May only be called on the io
   // thread.
@@ skipping 42 matching lines @@
   scoped_refptr<ChromeAppCacheService> appcache_service_;
 
   // If non-empty, the extension we're deleting is an isolated app, and this
   // is its directory which we should delete.
   FilePath isolated_app_path_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionDataDeleter);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_DATA_DELETER_H_