cros: Remove usage of GaiaScreenHandler outside of login/webui.

chrome/browser/ui/webui/chromeos/login/oobe_ui.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/oobe_ui.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 454 matching lines @@
 
 ErrorScreen* OobeUI::GetErrorScreen() {
   return error_screen_.get();
 }
 
 SupervisedUserCreationScreenHandler*
 OobeUI::GetSupervisedUserCreationScreenView() {
   return supervised_user_creation_screen_view_;
 }
 
-GaiaScreenHandler* OobeUI::GetGaiaScreenView() {
+GaiaView* OobeUI::GetGaiaScreenView() {
   return gaia_screen_handler_;
 }
 
 UserBoardView* OobeUI::GetUserBoardView() {
   return user_board_screen_handler_;
 }
 
 void OobeUI::OnShutdownPolicyChanged(bool reboot_on_shutdown) {
   core_handler_->UpdateShutdownAndRebootVisibility(reboot_on_shutdown);
 }
@@ skipping 151 matching lines @@
       g_browser_process->local_state()->GetBoolean(prefs::kOobeMdMode)) {
     return;
   }
 
   base::DictionaryValue localized_strings;
   GetLocalizedStrings(&localized_strings);
   static_cast<CoreOobeView*>(core_handler_)->ReloadContent(localized_strings);
 }
 
 }  // namespace chromeos