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

ui/aura_shell/desktop_window.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/aura/desktop.h"
 #include "ui/aura/toplevel_window_container.h"
 #include "ui/aura/window.h"
 #include "ui/aura_shell/desktop_layout_manager.h"
 #include "ui/aura_shell/shell_factory.h"
 
 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 =
       new internal::DesktopLayoutManager(desktop_window);
   desktop_window->SetLayoutManager(desktop_layout);
 
   // 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());
 }
 
 }  // namespace aura_shell