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

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

Index: chrome/browser/ui/webui/chromeos/login/terms_of_service_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/terms_of_service_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/terms_of_service_screen_handler.cc
index d3453eea0f46ab238fd6b0e585e7ae2dce04ad8c..79f2b10c3d821dbad7162af1dc28184f61a38609 100644
--- a/chrome/browser/ui/webui/chromeos/login/terms_of_service_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/terms_of_service_screen_handler.cc
@@ -140,8 +140,7 @@ 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();