Removed unused TrayBarButtonWithTitle class.

ash/common/system/tray/tray_bar_button_with_title.h

-// Copyright 2013 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_TRAY_TRAY_BAR_BUTTON_WITH_TITLE_H_
-#define ASH_COMMON_SYSTEM_TRAY_TRAY_BAR_BUTTON_WITH_TITLE_H_
-
-#include "base/macros.h"
-#include "ui/views/controls/button/custom_button.h"
-
-namespace views {
-class Label;
-}
-
-namespace ash {
-
-// A button with a bar image and title text below the bar image. These buttons
-// will be used in audio and brightness control UI, which can be toggled with
-// on/off states.
-class TrayBarButtonWithTitle : public views::CustomButton {
- public:
-  TrayBarButtonWithTitle(views::ButtonListener* listener,
-                         int title_id,
-                         int width);
-  ~TrayBarButtonWithTitle() override;
-
-  void UpdateButton(bool control_on);
-
- private:
-  class TrayBarButton;
-
-  // Overridden from views::CustomButton:
-  gfx::Size GetPreferredSize() const override;
-  void Layout() override;
-
-  TrayBarButton* image_;
-  views::Label* title_;
-  int width_;
-  int image_height_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayBarButtonWithTitle);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_BAR_BUTTON_WITH_TITLE_H_