Remove DeleteTask and convert remaining users.

chrome/browser/sync/glue/data_type_controller.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_SYNC_GLUE_DATA_TYPE_CONTROLLER_H__
 #define CHROME_BROWSER_SYNC_GLUE_DATA_TYPE_CONTROLLER_H__
 #pragma once
 
 #include <map>
 #include <string>
 
 #include "base/callback.h"
 #include "base/location.h"
+#include "base/message_loop_helpers.h"
 #include "chrome/browser/sync/engine/model_safe_worker.h"
 #include "chrome/browser/sync/internal_api/includes/unrecoverable_error_handler.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 #include "content/public/browser/browser_thread.h"
 
 class SyncError;
 
 namespace browser_sync {
 
 // Data type controllers need to be refcounted threadsafe, as they may
@@ skipping 63 matching lines @@
   // thread that should be used to modify the data type's native
   // model.
   virtual browser_sync::ModelSafeGroup model_safe_group() const = 0;
 
   // Current state of the data type controller.
   virtual State state() const = 0;
 
  protected:
   friend struct content::BrowserThread::DeleteOnThread<
       content::BrowserThread::UI>;
-  friend class DeleteTask<DataTypeController>;
-  friend class ShutdownTask;
+  friend class base::DeleteHelper<DataTypeController>;
 
   virtual ~DataTypeController() {}
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_DATA_TYPE_CONTROLLER_H__