mash: Move TrayUpdate to //ash/common

ash/common/system/update/tray_update.h

Index: ash/common/system/update/tray_update.h
diff --git a/ash/system/tray_update.h b/ash/common/system/update/tray_update.h
similarity index 86%
rename from ash/system/tray_update.h
rename to ash/common/system/update/tray_update.h
index 4340bebba77d67b100b4a05866f73aae75c4a33e..5cf23f7002701f4e9837b28117fe9aaf4a2c23b5 100644
--- a/ash/system/tray_update.h
+++ b/ash/common/system/update/tray_update.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SYSTEM_TRAY_UPDATE_H_
-#define ASH_SYSTEM_TRAY_UPDATE_H_
+#ifndef ASH_COMMON_SYSTEM_UPDATE_TRAY_UPDATE_H_
+#define ASH_COMMON_SYSTEM_UPDATE_TRAY_UPDATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/system/tray/tray_image_item.h"
@@ -35,4 +35,4 @@ class ASH_EXPORT TrayUpdate : public TrayImageItem, public UpdateObserver {
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_UPDATE_H_
+#endif  // ASH_COMMON_SYSTEM_UPDATE_TRAY_UPDATE_H_