ScreenObserver is renamed to BaseScreenDelegate.

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

 // Copyright 2014 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/host_pairing_screen.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
 #include "components/pairing/host_pairing_controller.h"
 
 namespace chromeos {
 
 using namespace host_pairing;
 using namespace pairing_chromeos;
 
 HostPairingScreen::HostPairingScreen(
-    ScreenObserver* observer,
+    BaseScreenDelegate* base_screen_delegate,
     HostPairingScreenActor* actor,
     pairing_chromeos::HostPairingController* remora_controller)
-    : BaseScreen(observer),
+    : BaseScreen(base_screen_delegate),
       actor_(actor),
       remora_controller_(remora_controller),
       delegate_(nullptr),
       current_stage_(HostPairingController::STAGE_NONE) {
   actor_->SetDelegate(this);
   remora_controller_->AddObserver(this);
 }
 
 HostPairingScreen::~HostPairingScreen() {
   if (actor_)
@@ skipping 63 matching lines @@
                                       const std::string& keyboard_layout) {
   VLOG(1) << "ConfigureHostMessage language=" << lang
           << ", timezone=" << timezone
           << ", keyboard_layout=" << keyboard_layout;
 
   remora_controller_->RemoveObserver(this);
   if (delegate_) {
     delegate_->ConfigureHost(
         accepted_eula, lang, timezone, send_reports, keyboard_layout);
   }
-  get_screen_observer()->OnExit(WizardController::HOST_PAIRING_FINISHED);
+  get_base_screen_delegate()->OnExit(WizardController::HOST_PAIRING_FINISHED);
 }
 
 void HostPairingScreen::EnrollHost(const std::string& auth_token) {
   NOTREACHED();
 }
 
 void HostPairingScreen::OnActorDestroyed(HostPairingScreenActor* actor) {
   if (actor_ == actor)
     actor_ = NULL;
 }
 
 }  // namespace chromeos