chromeos: Move device shutdown handling out of chrome into ash

ash/wm/shutdown_client_proxy.h

-// Copyright 2016 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 ASH_WM_SHUTDOWN_CLIENT_PROXY_H_
-#define ASH_WM_SHUTDOWN_CLIENT_PROXY_H_
-
-#include "ash/public/interfaces/shutdown.mojom.h"
-#include "base/macros.h"
-
-namespace service_manager {
-class Connector;
-}
-
-namespace ash {
-
-// A ShutdownClientProxy which lazily connects to an exported
-// mojom::ShutdownClient in "service:content_browser" on each use. This exists
-// so we can replace an instance of this class with a TestShutdownClient in
-// tests.
-class ShutdownClientProxy : public mojom::ShutdownClient {
- public:
-  explicit ShutdownClientProxy(service_manager::Connector* connector);
-  ~ShutdownClientProxy() override;
-
-  // mojom::ShutdownClient:
-  void RequestShutdown() override;
-
- private:
-  service_manager::Connector* connector_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShutdownClientProxy);
-};
-
-}  // namespace ash
-
-#endif  // ASH_WM_SHUTDOWN_CLIENT_PROXY_H_