ChromeOS: user whitelist check should happen before entering password.

chrome/browser/chromeos/login/app_launch_signin_screen.cc

 // Copyright 2013 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/app_launch_signin_screen.h"
 
 #include "base/values.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
 #include "chrome/browser/chromeos/login/screens/user_selection_screen.h"
 #include "chrome/browser/chromeos/login/session/user_session_manager.h"
@@ skipping 202 matching lines @@
         user_dict);
     users_list.Append(user_dict);
   }
 
   webui_handler_->LoadUsers(users_list, false);
 }
 
 void AppLaunchSigninScreen::CheckUserStatus(const std::string& user_id) {
 }
 
+bool AppLaunchSigninScreen::IsUserWhitelisted(const std::string& user_id) {
+  NOTREACHED();
+  return true;
+}
+
 }  // namespace chromeos