Makes a couple of tests properly delete aura state. These tests don't

chrome/test/base/chrome_render_view_host_test_harness.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 "chrome/test/base/chrome_render_view_host_test_harness.h"
 
 #include "chrome/test/base/testing_profile.h"
 
+#if defined(USE_AURA)
+#include "ui/aura/root_window.h"
+#include "ui/aura_shell/shell.h"
+#endif
+
 ChromeRenderViewHostTestHarness::ChromeRenderViewHostTestHarness()
     : RenderViewHostTestHarness() {
 }
 
 ChromeRenderViewHostTestHarness::~ChromeRenderViewHostTestHarness() {
 }
 
 TestingProfile* ChromeRenderViewHostTestHarness::profile() {
   return static_cast<TestingProfile*>(browser_context_.get());
 }
 
 void ChromeRenderViewHostTestHarness::SetUp() {
   if (!browser_context_.get())
     browser_context_.reset(new TestingProfile());
   RenderViewHostTestHarness::SetUp();
 }
 
 void ChromeRenderViewHostTestHarness::TearDown() {
   RenderViewHostTestHarness::TearDown();
+#if defined(USE_AURA)
+  aura_shell::Shell::DeleteInstance();
+  aura::RootWindow::DeleteInstance();
+#endif
 }