cros: Cleanup lock screen and OOBE C++ backing code.

chrome/browser/chromeos/login/ui/login_display_host_impl.cc

 // Copyright 2014 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/login/ui/login_display_host_impl.h"
 
 #include <utility>
 #include <vector>
 
 #include "ash/common/wallpaper/wallpaper_controller.h"
@@ skipping 781 matching lines @@
   return new WizardController(this, oobe_ui);
 }
 
 void LoginDisplayHostImpl::OnBrowserCreated() {
   // Close lock window now so that the launched browser can receive focus.
   ResetLoginWindowAndView();
 }
 
 OobeUI* LoginDisplayHostImpl::GetOobeUI() const {
   if (!login_view_)
-    return NULL;
-  return static_cast<OobeUI*>(login_view_->GetWebUI()->GetController());
+    return nullptr;
+  return login_view_->GetOobeUI();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // LoginDisplayHostImpl, content:NotificationObserver:
 
 void LoginDisplayHostImpl::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   if (chrome::NOTIFICATION_LOGIN_OR_LOCK_WEBUI_VISIBLE == type ||
@@ skipping 553 matching lines @@
 
   locale_util::SwitchLanguageCallback callback(
       base::Bind(&OnLanguageSwitchedCallback, base::Passed(std::move(data))));
 
   // Load locale keyboards here. Hardware layout would be automatically enabled.
   locale_util::SwitchLanguage(locale, true, true /* login_layouts_only */,
                               callback, ProfileManager::GetActiveUserProfile());
 }
 
 }  // namespace chromeos