Fixes aura unit tests. There were a couple of problems:

ui/aura_shell/desktop_window.cc

Index: ui/aura_shell/desktop_window.cc
diff --git a/ui/aura_shell/desktop_window.cc b/ui/aura_shell/desktop_window.cc
index 9feb0ae0b6eb9540df606c4d2f7d8bfd19e7959e..6f159f960b6630c4acc9f9f7a9478331855f10c9 100644
--- a/ui/aura_shell/desktop_window.cc
+++ b/ui/aura_shell/desktop_window.cc
@@ -10,20 +10,6 @@
 
 namespace aura_shell {
 
-namespace internal {
-
-aura::Window* CreateToplevelWindowContainer() {
-  aura::Window* container = new aura::internal::ToplevelWindowContainer;
-  container->Init();
-  container->SetBounds(gfx::Rect(0, 0, 1024, 768), 0);
-  container->SetVisibility(aura::Window::VISIBILITY_SHOWN);
-  container->SetParent(aura::Desktop::GetInstance()->window());
-  aura::Desktop::GetInstance()->set_toplevel_window_container(container);
-  return container;
-}
-
-}  // namespace internal
-
 void InitDesktopWindow() {
   aura::Window* desktop_window = aura::Desktop::GetInstance()->window();
   internal::DesktopLayoutManager* desktop_layout =
@@ -33,7 +19,9 @@ void InitDesktopWindow() {
   // The order of creation here is important to establish the z-index:
   desktop_layout->set_background_widget(internal::CreateDesktopBackground());
   desktop_layout->set_toplevel_window_container(
-      internal::CreateToplevelWindowContainer());
+      aura::Desktop::GetInstance()->toplevel_window_container());
+  desktop_window->MoveChildToFront(
+      aura::Desktop::GetInstance()->toplevel_window_container());
   desktop_layout->set_launcher_widget(internal::CreateLauncher());
   desktop_layout->set_status_area_widget(internal::CreateStatusArea());
 }