aura: Remove layerless windows.

ash/root_window_controller_unittest.cc

Index: ash/root_window_controller_unittest.cc
diff --git a/ash/root_window_controller_unittest.cc b/ash/root_window_controller_unittest.cc
index 0c321df8e234b0fa1189100258c442f59680988b..b29ccffd7777e29374cb21effc9d2b19d287bd7d 100644
--- a/ash/root_window_controller_unittest.cc
+++ b/ash/root_window_controller_unittest.cc
@@ -558,7 +558,7 @@ TEST_F(RootWindowControllerTest, DontDeleteWindowsNotOwnedByParent) {
   window1->SetType(ui::wm::WINDOW_TYPE_CONTROL);
   window1->set_owned_by_parent(false);
   observer1.SetWindow(window1);
-  window1->Init(aura::WINDOW_LAYER_NOT_DRAWN);
+  window1->Init(ui::LAYER_NOT_DRAWN);
   aura::client::ParentWindowWithContext(
       window1, Shell::GetInstance()->GetPrimaryRootWindow(), gfx::Rect());
 
@@ -566,7 +566,7 @@ TEST_F(RootWindowControllerTest, DontDeleteWindowsNotOwnedByParent) {
   aura::Window* window2 = new aura::Window(NULL);
   window2->set_owned_by_parent(false);
   observer2.SetWindow(window2);
-  window2->Init(aura::WINDOW_LAYER_NOT_DRAWN);
+  window2->Init(ui::LAYER_NOT_DRAWN);
   Shell::GetInstance()->GetPrimaryRootWindow()->AddChild(window2);
 
   Shell::GetInstance()->GetPrimaryRootWindowController()->CloseChildWindows();