chromeos: Remove old status-area related code.

chrome/browser/chromeos/status/volume_menu_button.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_CHROMEOS_STATUS_VOLUME_MENU_BUTTON_H_
-#define CHROME_BROWSER_CHROMEOS_STATUS_VOLUME_MENU_BUTTON_H_
-#pragma once
-
-#include "base/compiler_specific.h"
-#include "chrome/browser/chromeos/audio/audio_handler.h"
-#include "chrome/browser/chromeos/status/status_area_button.h"
-#include "ui/views/controls/button/menu_button_listener.h"
-#include "ui/views/controls/menu/menu_delegate.h"
-
-namespace chromeos {
-
-// The volume button in the status area.
-class VolumeMenuButton : public StatusAreaButton,
-                         public views::MenuDelegate,
-                         public views::MenuButtonListener,
-                         public AudioHandler::VolumeObserver {
- public:
-  explicit VolumeMenuButton(StatusAreaButton::Delegate* delegate);
-  virtual ~VolumeMenuButton();
-
-  // Update the volume icon.
-  void UpdateIcon();
-
- protected:
-  // StatusAreaButton implementation.
-  virtual int icon_width() OVERRIDE;
-
- private:
-  // views::View implementation.
-  virtual void OnLocaleChanged() OVERRIDE;
-
-  // views::MenuButtonListener implementation.
-  virtual void OnMenuButtonClicked(views::View* source,
-                                   const gfx::Point& point) OVERRIDE;
-
-  // AudioHandler::VolumeObserver implementation.
-  virtual void OnVolumeChanged() OVERRIDE;
-
-  DISALLOW_COPY_AND_ASSIGN(VolumeMenuButton);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_STATUS_VOLUME_MENU_BUTTON_H_