ScreenObserver is renamed to BaseScreenDelegate.

chrome/browser/chromeos/login/screens/controller_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/controller_pairing_screen.h"
 
 #include "base/command_line.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
 #include "google_apis/gaia/gaia_auth_util.h"
 
 using namespace chromeos::controller_pairing;
 using namespace pairing_chromeos;
 
 namespace chromeos {
 
 ControllerPairingScreen::ControllerPairingScreen(
-    ScreenObserver* observer,
+    BaseScreenDelegate* base_screen_delegate,
     ControllerPairingScreenActor* actor,
     ControllerPairingController* shark_controller)
-    : BaseScreen(observer),
+    : BaseScreen(base_screen_delegate),
       actor_(actor),
       shark_controller_(shark_controller),
       delegate_(nullptr),
       current_stage_(ControllerPairingController::STAGE_NONE),
       device_preselected_(false) {
   actor_->SetDelegate(this);
   shark_controller_->AddObserver(this);
 }
 
 ControllerPairingScreen::~ControllerPairingScreen() {
@@ skipping 79 matching lines @@
     case ControllerPairingController::STAGE_HOST_UPDATE_IN_PROGRESS: {
       desired_page = kPageHostUpdate;
       break;
     }
     case ControllerPairingController::STAGE_HOST_CONNECTION_LOST: {
       desired_page = kPageHostConnectionLost;
       break;
     }
     case ControllerPairingController::STAGE_WAITING_FOR_CREDENTIALS: {
       shark_controller_->RemoveObserver(this);
-      get_screen_observer()->OnExit(
+      get_base_screen_delegate()->OnExit(
           WizardController::CONTROLLER_PAIRING_FINISHED);
       desired_page = kPageEnrollmentIntroduction;
       break;
     }
     case ControllerPairingController::STAGE_INITIALIZATION_ERROR: {
       // TODO(achuith, dzhioev, zork): Handle this better.
       LOG(WARNING) << "Bluetooth initialization error";
       break;
     }
     default:
@@ skipping 82 matching lines @@
        ++key) {
     if (*key == kContextKeySelectedDevice) {
       context_.SetBoolean(kContextKeyControlsDisabled,
                           context_.GetString(*key).empty());
       CommitContextChanges();
     }
   }
 }
 
 }  // namespace chromeos