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

ash/common/system/user/user_card_view.h

Index: ash/common/system/user/user_card_view.h
diff --git a/ash/system/user/user_card_view.h b/ash/common/system/user/user_card_view.h
similarity index 87%
rename from ash/system/user/user_card_view.h
rename to ash/common/system/user/user_card_view.h
index 2d9584b64367dfface6307a8f84e259afc40af87..07504afa0f7346e6384566418d4f4f359e0eab80 100644
--- a/ash/system/user/user_card_view.h
+++ b/ash/common/system/user/user_card_view.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_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"
@@ -40,4 +40,4 @@ class UserCardView : public views::View {
 }  // namespace tray
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_USER_USER_CARD_VIEW_H_
+#endif  // ASH_COMMON_SYSTEM_USER_USER_CARD_VIEW_H_