Execute AuthenticateToLogin on UI thread.

chrome/browser/chromeos/login/login_screen.cc

 // Copyright (c) 2010 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/login_screen.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/callback.h"
 #include "base/logging.h"
@@ skipping 30 matching lines @@
 }
 
 NewUserView* LoginScreen::AllocateView() {
   return new NewUserView(this, true);
 }
 
 void LoginScreen::OnLogin(const std::string& username,
                           const std::string& password) {
   Profile* profile = g_browser_process->profile_manager()->GetDefaultProfile();
   ChromeThread::PostTask(
-      ChromeThread::FILE, FROM_HERE,
+      ChromeThread::UI, FROM_HERE,
       NewRunnableMethod(authenticator_.get(),
                         &Authenticator::AuthenticateToLogin,
                         profile, username, password));
 }
 
 void LoginScreen::OnLoginOffTheRecord() {
   ChromeThread::PostTask(
       ChromeThread::UI, FROM_HERE,
       NewRunnableMethod(authenticator_.get(),
                         &Authenticator::LoginOffTheRecord));
@@ skipping 45 matching lines @@
   bubble_ = MessageBubble::Show(
       view()->GetWidget(),
       view()->GetPasswordBounds(),
       BubbleBorder::LEFT_TOP,
       ResourceBundle::GetSharedInstance().GetBitmapNamed(IDR_WARNING),
       error_text,
       this);
 }
 
 }  // namespace chromeos