mash: Move SystemTrayImage and TrayImageItem to //ash/common

ash/common/system/tray/system_tray_item.h

Index: ash/common/system/tray/system_tray_item.h
diff --git a/ash/system/tray/system_tray_item.h b/ash/common/system/tray/system_tray_item.h
similarity index 95%
rename from ash/system/tray/system_tray_item.h
rename to ash/common/system/tray/system_tray_item.h
index 063c521f59b5ad95c7e08e6bd4b1ab7fdc2830b7..2afb4b494aebb6bec6bad5897f1314da28d8bda8 100644
--- a/ash/system/tray/system_tray_item.h
+++ b/ash/common/system/tray/system_tray_item.h
@@ -2,13 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
-#define ASH_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
+#ifndef ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
+#define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
 
 #include "ash/ash_export.h"
+#include "ash/common/login_status.h"
 #include "ash/common/shelf/shelf_types.h"
-#include "ash/system/user/login_status.h"
-#include "base/compiler_specific.h"
 #include "base/macros.h"
 
 namespace views {
@@ -118,4 +117,4 @@ class ASH_EXPORT SystemTrayItem {
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_
+#endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_ITEM_H_