Revert of Follow up change for disabling out-of-box VK overscroll

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 "ash/ash_switches.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted_memory.h"
@@ skipping 291 matching lines @@
 }
 
 void OobeUI::ShowScreen(WizardScreen* screen) {
   screen->Show();
 }
 
 void OobeUI::HideScreen(WizardScreen* screen) {
   screen->Hide();
 }
 
-CoreOobeActor* OobeUI::GetCoreOobeActor() {
-  return core_handler_;
-}
-
 UpdateScreenActor* OobeUI::GetUpdateScreenActor() {
   return update_screen_handler_;
 }
 
 NetworkScreenActor* OobeUI::GetNetworkScreenActor() {
   return network_screen_actor_;
 }
 
 EulaScreenActor* OobeUI::GetEulaScreenActor() {
   return eula_screen_actor_;
@@ skipping 184 matching lines @@
                       observer_list_,
                       OnCurrentScreenChanged(current_screen_, new_screen));
     current_screen_ = new_screen;
   } else {
     NOTREACHED() << "Screen should be registered in InitializeScreenMaps()";
     current_screen_ = SCREEN_UNKNOWN;
   }
 }
 
 }  // namespace chromeos