chromeos: Move files in //ash/common to //ash, part 2

ash/common/wm/window_state_util.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_COMMON_WM_WINDOW_STATE_UTIL_H_
-#define ASH_COMMON_WM_WINDOW_STATE_UTIL_H_
-
-#include "ash/ash_export.h"
-
-namespace ash {
-namespace wm {
-class WindowState;
-class WindowStateDelegate;
-
-// Toggle the full screen from inside a WindowState::State handler.
-ASH_EXPORT void ToggleFullScreen(WindowState* window_state,
-                                 WindowStateDelegate* delegate);
-
-}  // namespace wm
-}  // namespace ash
-
-#endif  // ASH_COMMON_WM_WINDOW_STATE_UTIL_H_