Implemented system tray UI for new account management.

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_SYSTEM_AUDIO_VOLUME_VIEW_H_
 #define ASH_SYSTEM_AUDIO_VOLUME_VIEW_H_
 
 #include "ash/system/tray/actionable_view.h"
 #include "ui/gfx/font.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/controls/slider.h"
 
 namespace views {
 class View;
 class ImageView;
 }
 
 namespace ash {
 
 class SystemTrayItem;
 
 namespace system {
 class TrayAudioDelegate;
 }
 
 namespace internal {
 
-class HoverHighlightView;
-
 namespace tray {
 
 class BarSeparator;
 class VolumeButton;
 class VolumeSlider;
 
 class VolumeView : public ActionableView,
                    public views::ButtonListener,
                    public views::SliderListener {
  public:
@@ skipping 41 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(VolumeView);
 };
 
 }  // namespace tray
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_AUDIO_VOLUME_VIEW_H_