Revert 124471 - Fix unit_tests on cros. Looks like I forgot another instance of CreateInstance()

chrome/browser/chromeos/notifications/desktop_notifications_unittest.cc

 // Copyright (c) 2012 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/browser/chromeos/notifications/desktop_notifications_unittest.h"
 
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/prefs/browser_prefs.h"
 #include "chrome/browser/prefs/pref_service.h"
@@ skipping 96 matching lines @@
 DesktopNotificationsTest::DesktopNotificationsTest()
     : ui_thread_(BrowserThread::UI, &message_loop_) {
 }
 
 DesktopNotificationsTest::~DesktopNotificationsTest() {
 }
 
 void DesktopNotificationsTest::SetUp() {
 #if defined(USE_AURA)
   // Make sure a root window has been instantiated.
-  ash::Shell::CreateInstance(NULL);
+  ash::Shell::GetRootWindow();
 #endif
   browser::RegisterLocalState(&local_state_);
   profile_.reset(new TestingProfile());
   balloon_collection_ = new MockBalloonCollection();
   ui_manager_.reset(NotificationUIManager::Create(&local_state_,
                                                   balloon_collection_));
   service_.reset(new DesktopNotificationService(profile(), ui_manager_.get()));
   log_output_.clear();
 }
 
@@ skipping 183 matching lines @@
 
   MessageLoopForUI::current()->RunAllPending();
   EXPECT_EQ(1, balloon_collection_->count());
   Balloon* balloon = (*balloon_collection_->balloons().begin());
   GURL data_url = balloon->notification().content_url();
   EXPECT_EQ(std::string::npos, data_url.spec().find("<script>"));
   EXPECT_EQ(std::string::npos, data_url.spec().find("<i>"));
 }
 
 }  // namespace chromeos