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

ash/system/bluetooth/tray_bluetooth.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_BLUETOOTH_TRAY_BLUETOOTH_H_
-#define ASH_SYSTEM_BLUETOOTH_TRAY_BLUETOOTH_H_
-
-#include "ash/system/bluetooth/bluetooth_observer.h"
-#include "ash/system/tray/system_tray_item.h"
-#include "base/macros.h"
-
-namespace ash {
-namespace tray {
-class BluetoothDefaultView;
-class BluetoothDetailedView;
-}
-
-class TrayBluetooth : public SystemTrayItem, public BluetoothObserver {
- public:
-  explicit TrayBluetooth(SystemTray* system_tray);
-  ~TrayBluetooth() override;
-
- private:
-  // Overridden from SystemTrayItem.
-  views::View* CreateTrayView(LoginStatus status) override;
-  views::View* CreateDefaultView(LoginStatus status) override;
-  views::View* CreateDetailedView(LoginStatus status) override;
-  void DestroyTrayView() override;
-  void DestroyDefaultView() override;
-  void DestroyDetailedView() override;
-  void UpdateAfterLoginStatusChange(LoginStatus status) override;
-
-  // Overridden from BluetoothObserver.
-  void OnBluetoothRefresh() override;
-  void OnBluetoothDiscoveringChanged() override;
-
-  tray::BluetoothDefaultView* default_;
-  tray::BluetoothDetailedView* detailed_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayBluetooth);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_BLUETOOTH_TRAY_BLUETOOTH_H_