Cleanup enums for shelf

ash/system/status_area_widget.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_STATUS_AREA_WIDGET_H_
 #define ASH_SYSTEM_STATUS_AREA_WIDGET_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/background_animator.h"
+#include "ash/shelf_types.h"
 #include "ash/system/user/login_status.h"
-#include "ash/wm/shelf_types.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 
 class ShellDelegate;
 class SystemTray;
 class WebNotificationTray;
 
 namespace internal {
 
@@ skipping 61 matching lines @@
   WebNotificationTray* web_notification_tray_;
   user::LoginStatus login_status_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusAreaWidget);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_STATUS_AREA_WIDGET_H_