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

ash/wm/window_parenting_utils.h

Index: ash/wm/window_parenting_utils.h
diff --git a/ash/wm/window_parenting_utils.h b/ash/wm/window_parenting_utils.h
deleted file mode 100644
index 86f5f8b482f04ccfbc0499926a82d0128832a932..0000000000000000000000000000000000000000
--- a/ash/wm/window_parenting_utils.h
+++ /dev/null
@@ -1,30 +0,0 @@
-// 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_PARENTING_UTILS_H_
-#define ASH_WM_WINDOW_PARENTING_UTILS_H_
-
-namespace ash {
-
-class WmWindow;
-
-namespace wm {
-
-// Changes the parent of a |child| and all its transient children that are
-// themselves children of |old_parent| to |new_parent|.
-void ReparentChildWithTransientChildren(WmWindow* child,
-                                        WmWindow* old_parent,
-                                        WmWindow* new_parent);
-
-// Changes the parent of all transient children of a |child| to |new_parent|.
-// Does not change parent of the transient children that are not themselves
-// children of |old_parent|.
-void ReparentTransientChildrenOfChild(WmWindow* child,
-                                      WmWindow* old_parent,
-                                      WmWindow* new_parent);
-
-}  // namespace wm
-}  // namespace ash
-
-#endif  // ASH_WM_WINDOW_PARENTING_UTILS_H_