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

ash/common/system/user/user_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_VIEW_H_
-#define ASH_SYSTEM_USER_USER_VIEW_H_
+#ifndef ASH_COMMON_SYSTEM_USER_USER_VIEW_H_
+#define ASH_COMMON_SYSTEM_USER_USER_VIEW_H_
 
 #include <memory>
 
 #include "ash/common/session/session_types.h"
 #include "ash/common/system/tray/tray_constants.h"
-#include "ash/system/user/tray_user.h"
+#include "ash/common/system/user/tray_user.h"
 #include "base/macros.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/layout/box_layout.h"
 #include "ui/views/mouse_watcher.h"
 #include "ui/views/view.h"
 
 namespace gfx {
 class Rect;
 class Size;
@@ skipping 74 matching lines @@
 
   // The focus manager which we use to detect focus changes.
   views::FocusManager* focus_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(UserView);
 };
 
 }  // namespace tray
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_USER_USER_VIEW_H_
+#endif  // ASH_COMMON_SYSTEM_USER_USER_VIEW_H_