mash: Move SystemTrayDelegate and dependencies to //ash/common

chrome/browser/ui/ash/volume_controller_chromeos.h

 // Copyright (c) 2012 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 CHROME_BROWSER_UI_ASH_VOLUME_CONTROLLER_CHROMEOS_H_
 #define CHROME_BROWSER_UI_ASH_VOLUME_CONTROLLER_CHROMEOS_H_
 
 #include <stdint.h>
 
-#include "ash/volume_control_delegate.h"
+#include "ash/common/system/volume_control_delegate.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chromeos/audio/cras_audio_handler.h"
 #include "ui/base/accelerators/accelerator.h"
 
 // A class which controls volume when F8-10 or a multimedia key for volume is
 // pressed.
 class VolumeController : public ash::VolumeControlDelegate,
                          public chromeos::CrasAudioHandler::AudioObserver {
  public:
   VolumeController();
   ~VolumeController() override;
 
   // Overridden from ash::VolumeControlDelegate:
   void HandleVolumeMute(const ui::Accelerator& accelerator) override;
   void HandleVolumeDown(const ui::Accelerator& accelerator) override;
   void HandleVolumeUp(const ui::Accelerator& accelerator) override;
 
   // Overridden from chromeos::CrasAudioHandler::AudioObserver.
   void OnOutputNodeVolumeChanged(uint64_t node_id, int volume) override;
   void OnOutputMuteChanged(bool mute_on, bool system_adjust) override;
 
  private:
 
   DISALLOW_COPY_AND_ASSIGN(VolumeController);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_VOLUME_CONTROLLER_CHROMEOS_H_