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

ash/common/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
+#ifndef ASH_COMMON_SYSTEM_CHROMEOS_ENTERPRISE_TRAY_ENTERPRISE_H_
+#define ASH_COMMON_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;
@@ skipping 13 matching lines @@
   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
+#endif  // ASH_COMMON_SYSTEM_CHROMEOS_ENTERPRISE_TRAY_ENTERPRISE_H_