Update window_parenting_utils to use aura::window

ash/common/wm/default_state.cc

Index: ash/common/wm/default_state.cc
diff --git a/ash/common/wm/default_state.cc b/ash/common/wm/default_state.cc
index 8149d7f856fc21a1871835fbd425b90fb7595c3e..dbaf92d1ad6448d70e84472d9c4b4fb99c4bac34 100644
--- a/ash/common/wm/default_state.cc
+++ b/ash/common/wm/default_state.cc
@@ -701,8 +701,9 @@ void DefaultState::UpdateBoundsFromState(WindowState* window_state,
         WmWindow* docked_container =
             window->GetRootWindow()->GetChildByShellWindowId(
                 kShellWindowId_DockedContainer);
-        ReparentChildWithTransientChildren(window, window->GetParent(),
-                                           docked_container);
+        ReparentChildWithTransientChildren(window->aura_window(),
+                                           window->aura_window()->parent(),
+                                           docked_container->aura_window());
       }
       // Return early because we don't want to update the bounds of the
       // window below; as the bounds are managed by the dock layout.