mash: Make the power button shut the system down.

ash/common/wm_shell.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_COMMON_WM_SHELL_H_
 #define ASH_COMMON_WM_SHELL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 412 matching lines @@
   // avoided if possible.
   virtual void AddPointerWatcher(views::PointerWatcher* watcher,
                                  views::PointerWatcherEventTypes events) = 0;
   virtual void RemovePointerWatcher(views::PointerWatcher* watcher) = 0;
 
   // TODO: Move these back to LockStateController when that has been moved.
   void OnLockStateEvent(LockStateObserver::EventType event);
   void AddLockStateObserver(LockStateObserver* observer);
   void RemoveLockStateObserver(LockStateObserver* observer);
 
-  // Displays the shutdown animation and requests a system shutdown or system
-  // restart depending on the the state of the |RebootOnShutdown| device policy.
-  // TODO(mash): Remove this method and call LockStateController directly when
-  // it is available to code in ash/common.
-  virtual void RequestShutdown() = 0;
-
   void SetShelfDelegateForTesting(std::unique_ptr<ShelfDelegate> test_delegate);
   void SetPaletteDelegateForTesting(
       std::unique_ptr<PaletteDelegate> palette_delegate);
 
   // True if any touch points are down.
   virtual bool IsTouchDown() = 0;
 
   // TODO(jamescook): Remove this when VirtualKeyboardController has been moved.
   virtual void ToggleIgnoreExternalKeyboard() = 0;
 
@@ skipping 102 matching lines @@
 
   bool added_activation_observer_ = false;
   base::ObserverList<WmActivationObserver> activation_observers_;
 
   scoped_refptr<base::SequencedWorkerPool> blocking_pool_;
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_SHELL_H_