Refactor the UpdateEngine and its actions in the component updater.

components/update_client/task_update.h

 // Copyright 2015 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 COMPONENTS_UPDATE_CLIENT_TASK_UPDATE_H_
 #define COMPONENTS_UPDATE_CLIENT_TASK_UPDATE_H_
 
-#include <queue>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "components/update_client/task.h"
 #include "components/update_client/update_client.h"
 
 namespace update_client {
@@ skipping 39 matching lines @@
   const std::vector<std::string> ids_;
   const UpdateClient::CrxDataCallback crx_data_callback_;
   const Callback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskUpdate);
 };
 
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_TASK_UPDATE_H_