mash: Make the power button shut the system down.

ash/mus/bridge/wm_shell_mus.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_MUS_BRIDGE_WM_SHELL_MUS_H_
 #define ASH_MUS_BRIDGE_WM_SHELL_MUS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 88 matching lines @@
   CreateImmersiveFullscreenController() override;
   std::unique_ptr<KeyEventWatcher> CreateKeyEventWatcher() override;
   void OnOverviewModeStarting() override;
   void OnOverviewModeEnded() override;
   SessionStateDelegate* GetSessionStateDelegate() override;
   void AddDisplayObserver(WmDisplayObserver* observer) override;
   void RemoveDisplayObserver(WmDisplayObserver* observer) override;
   void AddPointerWatcher(views::PointerWatcher* watcher,
                          views::PointerWatcherEventTypes events) override;
   void RemovePointerWatcher(views::PointerWatcher* watcher) override;
-  void RequestShutdown() override;
   bool IsTouchDown() override;
   void ToggleIgnoreExternalKeyboard() override;
   void SetLaserPointerEnabled(bool enabled) override;
   void CreatePointerWatcherAdapter() override;
   void CreatePrimaryHost() override;
   void InitHosts(const ShellInitParams& init_params) override;
 
  private:
   friend class WmShellMusTestApi;
 
   WindowManager* window_manager_;
 
   WmWindow* primary_root_window_;
   views::PointerWatcherEventRouter* pointer_watcher_event_router_;
 
   std::unique_ptr<AcceleratorControllerDelegateMus>
       accelerator_controller_delegate_;
   std::unique_ptr<AcceleratorControllerRegistrar>
       accelerator_controller_registrar_;
   std::unique_ptr<ImmersiveHandlerFactoryMus> immersive_handler_factory_;
   std::unique_ptr<SessionStateDelegate> session_state_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(WmShellMus);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_BRIDGE_WM_SHELL_MUS_H_