Renames WmWindowUserData and converts to using aura

ash/wm/system_modal_container_layout_manager_unittest.cc

Index: ash/wm/system_modal_container_layout_manager_unittest.cc
diff --git a/ash/wm/system_modal_container_layout_manager_unittest.cc b/ash/wm/system_modal_container_layout_manager_unittest.cc
index fc1c3aeb155fd3662d46c87dfcf75da35e033b77..e5a59844d083c41324227489040600ac9561dabd 100644
--- a/ash/wm/system_modal_container_layout_manager_unittest.cc
+++ b/ash/wm/system_modal_container_layout_manager_unittest.cc
@@ -48,12 +48,12 @@ aura::Window* GetModalContainer() {
 }
 
 bool AllRootWindowsHaveModalBackgroundsForContainer(int container_id) {
-  WmWindow::Windows containers =
+  aura::Window::Windows containers =
       wm::GetContainersFromAllRootWindows(container_id);
   bool has_modal_screen = !containers.empty();
-  for (WmWindow* container : containers) {
+  for (aura::Window* container : containers) {
     has_modal_screen &= static_cast<SystemModalContainerLayoutManager*>(
-                            container->GetLayoutManager())
+                            WmWindow::Get(container)->GetLayoutManager())
                             ->has_window_dimmer();
   }
   return has_modal_screen;