mash: Migrate ash/system/user to ash/common.

ash/common/system/user/user_card_view.h

 // Copyright 2014 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_USER_USER_CARD_VIEW_H_
-#define ASH_SYSTEM_USER_USER_CARD_VIEW_H_
+#ifndef ASH_COMMON_SYSTEM_USER_USER_CARD_VIEW_H_
+#define ASH_COMMON_SYSTEM_USER_USER_CARD_VIEW_H_
 
 #include "base/macros.h"
 #include "ui/views/view.h"
 
 namespace ash {
 
 enum class LoginStatus;
 
 namespace tray {
 
@@ skipping 16 matching lines @@
 
   // Create a user icon representation.
   views::View* CreateIcon(LoginStatus login_status, int user_index);
 
   DISALLOW_COPY_AND_ASSIGN(UserCardView);
 };
 
 }  // namespace tray
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_USER_USER_CARD_VIEW_H_
+#endif  // ASH_COMMON_SYSTEM_USER_USER_CARD_VIEW_H_