Make sure that OOBE resumes at the update screen when update was done.

chrome/browser/chromeos/login/screens/update_screen.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/chromeos/login/screens/update_screen.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 172 matching lines @@
       break;
     case UpdateEngineClient::UPDATE_STATUS_FINALIZING:
       MakeSureScreenIsShown();
       actor_->SetProgress(kBeforeFinalizingProgress);
       actor_->SetProgressMessage(
           UpdateScreenActor::PROGRESS_MESSAGE_FINALIZING);
       actor_->ShowProgressMessage(true);
       break;
     case UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT:
       MakeSureScreenIsShown();
-      // Make sure that first OOBE stage won't be shown after reboot.
-      StartupUtils::MarkOobeCompleted();
       actor_->SetProgress(kProgressComplete);
       actor_->ShowEstimatedTimeLeft(false);
       if (HasCriticalUpdate()) {
         actor_->ShowCurtain(false);
         VLOG(1) << "Initiate reboot after update";
         DBusThreadManager::Get()->GetUpdateEngineClient()->RebootAfterUpdate();
         reboot_timer_.Start(FROM_HERE,
                             base::TimeDelta::FromSeconds(reboot_check_delay_),
                             this,
                             &UpdateScreen::OnWaitForRebootTimeElapsed);
@@ skipping 309 matching lines @@
       GetErrorScreen()->SetErrorState(ErrorScreen::ERROR_STATE_PROXY,
                                       std::string());
       break;
     default:
       NOTREACHED();
       break;
   }
 }
 
 }  // namespace chromeos