mash: Move most files in //ash/system/tray to //ash/common/system/tray

ash/system/tray/tray_popup_header_button.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_SYSTEM_TRAY_TRAY_POPUP_HEADER_BUTTON_H_
-#define ASH_SYSTEM_TRAY_TRAY_POPUP_HEADER_BUTTON_H_
-
-#include "ash/ash_export.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "ui/views/controls/button/image_button.h"
-
-namespace ash {
-
-// A ToggleImageButton with fixed size, paddings and hover effects. These
-// buttons are used in the header.
-class ASH_EXPORT TrayPopupHeaderButton : public views::ToggleImageButton {
- public:
-  static const char kViewClassName[];
-
-  TrayPopupHeaderButton(views::ButtonListener* listener,
-                        int enabled_resource_id,
-                        int disabled_resource_id,
-                        int enabled_resource_id_hover,
-                        int disabled_resource_id_hover,
-                        int accessible_name_id);
-  ~TrayPopupHeaderButton() override;
-
- private:
-  // Overridden from views::View:
-  const char* GetClassName() const override;
-  gfx::Size GetPreferredSize() const override;
-
-  // Overridden from views::CustomButton:
-  void StateChanged() override;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayPopupHeaderButton);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_TRAY_TRAY_POPUP_HEADER_BUTTON_H_