Cleanup enums for shelf

ash/system/tray/tray_background_view.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_TRAY_TRAY_BACKGROUND_VIEW_H_
 #define ASH_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/background_animator.h"
+#include "ash/shelf_types.h"
 #include "ash/system/tray/tray_views.h"
-#include "ash/wm/shelf_types.h"
 #include "ui/views/bubble/tray_bubble_view.h"
 
 namespace ash {
 namespace internal {
 
 class ShelfLayoutManager;
 class StatusAreaWidget;
 class TrayBackground;
 // Base class for children of StatusAreaWidget: SystemTray, WebNotificationTray.
 // This class handles setting and animating the background when the Launcher
@@ skipping 135 matching lines @@
   internal::BackgroundAnimator hover_background_animator_;
   scoped_ptr<TrayWidgetObserver> widget_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBackgroundView);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_