chromeos: Move files in //ash/common to //ash

ash/common/scoped_root_window_for_new_windows.h

-// Copyright 2013 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_COMMON_SCOPED_ROOT_WINDOW_FOR_NEW_WINDOWS_H_
-#define ASH_COMMON_SCOPED_ROOT_WINDOW_FOR_NEW_WINDOWS_H_
-
-#include "ash/ash_export.h"
-#include "base/macros.h"
-
-namespace ash {
-
-class WmWindow;
-
-// Constructing a ScopedRootWindowForNewWindows allows temporarily
-// switching a target root window so that a new window gets created
-// in the same window where a user interaction happened.
-// An example usage is to specify the target root window when creating
-// a new window using launcher's icon.
-class ASH_EXPORT ScopedRootWindowForNewWindows {
- public:
-  explicit ScopedRootWindowForNewWindows(WmWindow* new_root);
-  ~ScopedRootWindowForNewWindows();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ScopedRootWindowForNewWindows);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_SCOPED_ROOT_WINDOW_FOR_NEW_WINDOWS_H_