Update window_parenting_utils to use aura::window

ash/common/wm/panels/panel_layout_manager.cc

Index: ash/common/wm/panels/panel_layout_manager.cc
diff --git a/ash/common/wm/panels/panel_layout_manager.cc b/ash/common/wm/panels/panel_layout_manager.cc
index 66ddd3cee80cc76ce0dcf02dc5af21f1b07b47f7..ee815ff11f1d8e774f4087dcae32c685efc84fa8 100644
--- a/ash/common/wm/panels/panel_layout_manager.cc
+++ b/ash/common/wm/panels/panel_layout_manager.cc
@@ -351,7 +351,9 @@ void PanelLayoutManager::OnWindowAddedToLayout(WmWindow* child) {
     WmWindow* old_parent = child->GetParent();
     child->SetParentUsingContext(child,
                                  child->GetRootWindow()->GetBoundsInScreen());
-    wm::ReparentTransientChildrenOfChild(child, old_parent, child->GetParent());
+    wm::ReparentTransientChildrenOfChild(child->aura_window(),
+                                         old_parent->aura_window(),
+                                         child->GetParent()->aura_window());
     DCHECK(child->GetParent()->GetShellWindowId() !=
            kShellWindowId_PanelContainer);
     return;