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

ash/wm/window_parenting_utils.cc

 // 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.
 
 #include "ash/wm/window_parenting_utils.h"
 
-#include "ash/common/wm_window.h"
+#include "ash/wm_window.h"
 
 namespace ash {
 namespace wm {
 
 void ReparentChildWithTransientChildren(WmWindow* child,
                                         WmWindow* old_parent,
                                         WmWindow* new_parent) {
   if (child->GetParent() == old_parent)
     new_parent->AddChild(child);
   ReparentTransientChildrenOfChild(child, old_parent, new_parent);
 }
 
 void ReparentTransientChildrenOfChild(WmWindow* child,
                                       WmWindow* old_parent,
                                       WmWindow* new_parent) {
   for (WmWindow* transient_child : child->GetTransientChildren())
     ReparentChildWithTransientChildren(transient_child, old_parent, new_parent);
 }
 
 }  // namespace wm
 }  // namespace ash