mash: Convert TrayBackgroundView to wm common types

ash/common/system/tray/tray_event_filter.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_EVENT_FILTER_H_
-#define ASH_SYSTEM_TRAY_TRAY_EVENT_FILTER_H_
+#ifndef ASH_COMMON_SYSTEM_TRAY_TRAY_EVENT_FILTER_H_
+#define ASH_COMMON_SYSTEM_TRAY_TRAY_EVENT_FILTER_H_
 
 #include <set>
 
 #include "base/macros.h"
 #include "ui/views/pointer_watcher.h"
 
 namespace gfx {
 class Point;
 }
 
@@ skipping 26 matching lines @@
   void ProcessPressedEvent(const gfx::Point& location_in_screen,
                            views::Widget* target);
 
   std::set<TrayBubbleWrapper*> wrappers_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayEventFilter);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_TRAY_EVENT_FILTER_H_
+#endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_EVENT_FILTER_H_