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

chrome/browser/ui/webui/chromeos/login/base_screen_handler.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/ui/webui/chromeos/login/base_screen_handler.h"
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/login/screens/base_screen.h"
@@ skipping 69 matching lines @@
   if (!web_ui())
     return;
   base::DictionaryValue screen_params;
   screen_params.SetString("id", GetOobeScreenName(screen));
   if (data)
     screen_params.SetWithoutPathExpansion("data", data->DeepCopy());
   web_ui()->CallJavascriptFunctionUnsafe("cr.ui.Oobe.showScreen",
                                          screen_params);
 }
 
+OobeUI* BaseScreenHandler::GetOobeUI() const {
+  return static_cast<OobeUI*>(web_ui()->GetController());
+}
+
 OobeScreen BaseScreenHandler::GetCurrentScreen() const {
-  OobeUI* oobe_ui = static_cast<OobeUI*>(web_ui()->GetController());
+  OobeUI* oobe_ui = GetOobeUI();
   if (!oobe_ui)
     return OobeScreen::SCREEN_UNKNOWN;
   return oobe_ui->current_screen();
 }
 
 gfx::NativeWindow BaseScreenHandler::GetNativeWindow() {
   return LoginDisplayHost::default_host()->GetNativeWindow();
 }
 
 void BaseScreenHandler::SetBaseScreen(BaseScreen* base_screen) {
@@ skipping 16 matching lines @@
     base_screen_->OnUserAction(action_id);
 }
 
 void BaseScreenHandler::HandleContextChanged(
     const base::DictionaryValue* diff) {
   if (diff && base_screen_)
     base_screen_->OnContextChanged(*diff);
 }
 
 }  // namespace chromeos