Revert of services/ui: Have an explicit lifetime/ownership of ui::GpuService.

ash/mus/window_manager_application.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 ASH_MUS_WINDOW_MANAGER_APPLICATION_H_
 #define ASH_MUS_WINDOW_MANAGER_APPLICATION_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 10 matching lines @@
 #include "services/tracing/public/cpp/tracing_impl.h"
 #include "services/ui/common/types.h"
 #include "services/ui/public/interfaces/accelerator_registrar.mojom.h"
 
 namespace views {
 class AuraInit;
 }
 
 namespace ui {
 class Event;
-class GpuService;
 class WindowTreeClient;
 }
 
 namespace ash {
 namespace mus {
 
 class AcceleratorRegistrarImpl;
 class RootWindowController;
 class ShelfLayoutImpl;
 class UserWindowControllerImpl;
@@ skipping 60 matching lines @@
       shelf_layout_requests_;
 
   // |user_window_controller_| is created once OnEmbed() is called. Until that
   // time |user_window_controller_requests_| stores pending interface requests.
   std::unique_ptr<UserWindowControllerImpl> user_window_controller_;
   mojo::BindingSet<mojom::UserWindowController>
       user_window_controller_bindings_;
   std::vector<mojo::InterfaceRequest<mojom::UserWindowController>>
       user_window_controller_requests_;
 
-  std::unique_ptr<ui::GpuService> gpu_service_;
   std::unique_ptr<WindowManager> window_manager_;
 
   std::set<AcceleratorRegistrarImpl*> accelerator_registrars_;
 
   mash::session::mojom::SessionPtr session_;
 
   mojo::Binding<mash::session::mojom::ScreenlockStateListener>
       screenlock_state_listener_binding_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerApplication);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_WINDOW_MANAGER_APPLICATION_H_