aura: Remove layerless windows.

ash/display/screen_position_controller_unittest.cc

Index: ash/display/screen_position_controller_unittest.cc
diff --git a/ash/display/screen_position_controller_unittest.cc b/ash/display/screen_position_controller_unittest.cc
index c568b503b48d1b4ca6ff6a55881c8939777b4cf7..cd9106f5ef1ba01208a4b640ca2bc0854596752c 100644
--- a/ash/display/screen_position_controller_unittest.cc
+++ b/ash/display/screen_position_controller_unittest.cc
@@ -63,7 +63,7 @@ class ScreenPositionControllerTest : public test::AshTestBase {
     AshTestBase::SetUp();
     window_.reset(new aura::Window(&window_delegate_));
     window_->SetType(ui::wm::WINDOW_TYPE_NORMAL);
-    window_->Init(aura::WINDOW_LAYER_NOT_DRAWN);
+    window_->Init(ui::LAYER_NOT_DRAWN);
     ParentWindowInPrimaryRootWindow(window_.get());
     window_->set_id(1);
   }