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

ash/system/update/tray_update.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 ASH_SYSTEM_UPDATE_TRAY_UPDATE_H_
-#define ASH_SYSTEM_UPDATE_TRAY_UPDATE_H_
-
-#include "ash/ash_export.h"
-#include "ash/system/tray/tray_image_item.h"
-#include "base/macros.h"
-
-namespace views {
-class View;
-}
-
-namespace ash {
-
-namespace mojom {
-enum class UpdateSeverity;
-}
-
-// The system update tray item. The tray icon stays visible once an update
-// notification is received. The icon only disappears after a reboot to apply
-// the update. Exported for test.
-class ASH_EXPORT TrayUpdate : public TrayImageItem {
- public:
-  explicit TrayUpdate(SystemTray* system_tray);
-  ~TrayUpdate() override;
-
-  // Shows an icon in the system tray indicating that a software update is
-  // available. Once shown the icon persists until reboot. |severity| and
-  // |factory_reset_required| are used to set the icon, color, and tooltip.
-  void ShowUpdateIcon(mojom::UpdateSeverity severity,
-                      bool factory_reset_required);
-
- private:
-  class UpdateView;
-
-  // Overridden from TrayImageItem.
-  bool GetInitialVisibility() override;
-  views::View* CreateDefaultView(LoginStatus status) override;
-
-  // If an external monitor is connected then the system tray may be created
-  // after the update data is sent from chrome, so share the update info between
-  // all instances.
-  static bool update_required_;
-  static mojom::UpdateSeverity severity_;
-  static bool factory_reset_required_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayUpdate);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_UPDATE_TRAY_UPDATE_H_