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

ash/common/system/tray/tray_image_item.h

Index: ash/common/system/tray/tray_image_item.h
diff --git a/ash/system/tray/tray_image_item.h b/ash/common/system/tray/tray_image_item.h
similarity index 87%
rename from ash/system/tray/tray_image_item.h
rename to ash/common/system/tray/tray_image_item.h
index 220924c3f33024ea1057413112e494df3bd1e96e..9c0578412b6ffb078bf4572bb3c3f6ae9b9c6e9a 100644
--- a/ash/system/tray/tray_image_item.h
+++ b/ash/common/system/tray/tray_image_item.h
@@ -2,11 +2,11 @@
 // 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_IMAGE_ITEM_H_
-#define ASH_SYSTEM_TRAY_TRAY_IMAGE_ITEM_H_
+#ifndef ASH_COMMON_SYSTEM_TRAY_TRAY_IMAGE_ITEM_H_
+#define ASH_COMMON_SYSTEM_TRAY_TRAY_IMAGE_ITEM_H_
 
 #include "ash/ash_export.h"
-#include "ash/system/tray/system_tray_item.h"
+#include "ash/common/system/tray/system_tray_item.h"
 #include "base/macros.h"
 
 namespace views {
@@ -51,4 +51,4 @@ class ASH_EXPORT TrayImageItem : public SystemTrayItem {
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_TRAY_TRAY_IMAGE_ITEM_H_
+#endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_IMAGE_ITEM_H_