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

chrome/browser/ui/webui/chromeos/login/terms_of_service_screen_handler.cc

 // Copyright (c) 2013 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/ui/webui/chromeos/login/terms_of_service_screen_handler.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 122 matching lines @@
   if (show_on_init_) {
     Show();
     show_on_init_ = false;
   }
 }
 
 void TermsOfServiceScreenHandler::OnLanguageChangedCallback(
     const locale_util::LanguageSwitchResult& result) {
   // Update the screen contents to the new locale.
   base::DictionaryValue localized_strings;
-  static_cast<OobeUI*>(web_ui()->GetController())
-      ->GetLocalizedStrings(&localized_strings);
+  GetOobeUI()->GetLocalizedStrings(&localized_strings);
   core_oobe_actor_->ReloadContent(localized_strings);
 
   DoShow();
 }
 
 void TermsOfServiceScreenHandler::DoShow() {
   // Determine the user's most preferred input method.
   std::vector<std::string> input_methods = base::SplitString(
       ProfileHelper::Get()
           ->GetProfileByUserUnsafe(
@@ skipping 53 matching lines @@
   // and continue" button should not be accessible. If the user managed to
   // activate it somehow anway, do not treat this as acceptance of the Terms
   // and Conditions and end the session instead, as if the user had declined.
   if (terms_of_service_.empty())
     screen_->OnDecline();
   else
     screen_->OnAccept();
 }
 
 }  // namespace chromeos