Migrate call sites LoginDisplayHostImpl::default_host to LoginDisplayHost.

chrome/browser/chromeos/login/demo_mode/demo_app_launcher.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/demo_mode/demo_app_launcher.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
+#include "chrome/browser/chromeos/app_mode/kiosk_app_manager.h"
 #include "chrome/browser/chromeos/login/ui/login_display_host.h"
-#include "chrome/browser/chromeos/login/ui/login_display_host_impl.h"
 #include "chrome/browser/extensions/component_loader.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/extensions/app_launch_params.h"
 #include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/grit/browser_resources.h"
 #include "chromeos/login/user_names.h"
@@ skipping 72 matching lines @@
                                 false,
                                 chromeos::network_handler::ErrorCallback());
 
   OpenApplication(
       AppLaunchParams(profile, extension, extensions::LAUNCH_CONTAINER_WINDOW,
                       NEW_WINDOW, extensions::SOURCE_CHROME_INTERNAL));
   KioskAppManager::Get()->InitSession(profile, extension_id);
 
   user_manager::UserManager::Get()->SessionStarted();
 
-  LoginDisplayHostImpl::default_host()->Finalize();
+  LoginDisplayHost::default_host()->Finalize();
 }
 
 void DemoAppLauncher::OnProfileLoadFailed(KioskAppLaunchError::Error error) {
   LOG(ERROR) << "Loading the Kiosk Profile failed: " <<
       KioskAppLaunchError::GetErrorMessage(error);
 }
 
 }  // namespace chromeos