mash: Move several chromeos system tray items to //ash/common

ash/system/chromeos/enterprise/tray_enterprise.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_CHROMEOS_ENTERPRISE_TRAY_ENTERPRISE_H
-#define ASH_SYSTEM_CHROMEOS_ENTERPRISE_TRAY_ENTERPRISE_H
-
-#include "ash/common/system/chromeos/enterprise/enterprise_domain_observer.h"
-#include "ash/common/system/tray/system_tray_item.h"
-#include "ash/common/system/tray/view_click_listener.h"
-#include "base/macros.h"
-
-namespace views {
-class View;
-}
-
-namespace ash {
-class LabelTrayView;
-class SystemTray;
-
-class TrayEnterprise : public SystemTrayItem,
-                       public ViewClickListener,
-                       public EnterpriseDomainObserver {
- public:
-  explicit TrayEnterprise(SystemTray* system_tray);
-  ~TrayEnterprise() override;
-
-  // If message is not empty updates content of default view, otherwise hides
-  // tray items.
-  void UpdateEnterpriseMessage();
-
-  // Overridden from SystemTrayItem.
-  views::View* CreateDefaultView(LoginStatus status) override;
-  void DestroyDefaultView() override;
-
-  // Overridden from EnterpriseDomainObserver.
-  void OnEnterpriseDomainChanged() override;
-
-  // Overridden from ViewClickListener.
-  void OnViewClicked(views::View* sender) override;
-
- private:
-  LabelTrayView* tray_view_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayEnterprise);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SYSTEM_CHROMEOS_ENTERPRISE_TRAY_ENTERPRISE_H