ScreenObserver is renamed to BaseScreenDelegate.

chrome/browser/chromeos/login/screens/kiosk_enable_screen.cc

 // Copyright 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/chromeos/login/screens/kiosk_enable_screen.h"
 
 #include "base/logging.h"
 #include "chrome/browser/chromeos/customization_document.h"
-#include "chrome/browser/chromeos/login/screens/screen_observer.h"
+#include "chrome/browser/chromeos/login/screens/base_screen_delegate.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
 
 namespace chromeos {
 
-KioskEnableScreen::KioskEnableScreen(ScreenObserver* observer,
+KioskEnableScreen::KioskEnableScreen(BaseScreenDelegate* base_screen_delegate,
                                      KioskEnableScreenActor* actor)
-    : BaseScreen(observer), actor_(actor) {
+    : BaseScreen(base_screen_delegate), actor_(actor) {
   DCHECK(actor_);
   if (actor_)
     actor_->SetDelegate(this);
 }
 
 KioskEnableScreen::~KioskEnableScreen() {
   if (actor_)
     actor_->SetDelegate(NULL);
 }
 
 void KioskEnableScreen::Show() {
   if (actor_)
     actor_->Show();
 }
 
 std::string KioskEnableScreen::GetName() const {
   return WizardController::kKioskEnableScreenName;
 }
 
 void KioskEnableScreen::OnExit() {
-  get_screen_observer()->OnExit(ScreenObserver::KIOSK_ENABLE_COMPLETED);
+  get_base_screen_delegate()->OnExit(
+      BaseScreenDelegate::KIOSK_ENABLE_COMPLETED);
 }
 
 void KioskEnableScreen::OnActorDestroyed(KioskEnableScreenActor* actor) {
   if (actor_ == actor)
     actor_ = NULL;
 }
 
 }  // namespace chromeos