Revert "chromeos: Move files in //ash/common to //ash, part 3"

ash/common/wm_window_user_data.h

 // Copyright 2016 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_WM_WINDOW_USER_DATA_H_
-#define ASH_WM_WINDOW_USER_DATA_H_
+#ifndef ASH_COMMON_WM_WINDOW_USER_DATA_H_
+#define ASH_COMMON_WM_WINDOW_USER_DATA_H_
 
 #include <map>
 #include <memory>
 #include <utility>
 
-#include "ash/wm_window.h"
+#include "ash/common/wm_window.h"
 #include "base/macros.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_observer.h"
 
 namespace ash {
 
 // WmWindowUserData provides a way to associate arbitrary objects with a
 // WmWindow. WmWindowUserData owns the data, deleting it either when
 // WmWindowUserData is deleted, or when the window the data is associated with
 // is destroyed (from aura::WindowObserver::OnWindowDestroying()).
@@ skipping 45 matching lines @@
     window_to_data_.erase(WmWindow::Get(window));
   }
 
   std::map<WmWindow*, std::unique_ptr<UserData>> window_to_data_;
 
   DISALLOW_COPY_AND_ASSIGN(WmWindowUserData);
 };
 
 }  // namespace ash
 
-#endif  // ASH_WM_WINDOW_USER_DATA_H_
+#endif  // ASH_COMMON_WM_WINDOW_USER_DATA_H_