chromeos: Move files in //ash/common to //ash, part 1

ash/system/audio/volume_view.h

 // Copyright 2014 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_SYSTEM_CHROMEOS_AUDIO_VOLUME_VIEW_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_AUDIO_VOLUME_VIEW_H_
+#ifndef ASH_SYSTEM_AUDIO_VOLUME_VIEW_H_
+#define ASH_SYSTEM_AUDIO_VOLUME_VIEW_H_
 
 #include "base/macros.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/controls/slider.h"
 #include "ui/views/view.h"
 
 namespace views {
 class CustomButton;
 class ImageView;
 }
@@ skipping 49 matching lines @@
   views::Slider* slider_;
   views::ImageView* device_type_;
   bool is_default_view_;
 
   DISALLOW_COPY_AND_ASSIGN(VolumeView);
 };
 
 }  // namespace tray
 }  // namespace ash
 
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_AUDIO_VOLUME_VIEW_H_
+#endif  // ASH_SYSTEM_AUDIO_VOLUME_VIEW_H_