Revert of This CL replaces e-mail with AccountId on user selection screen.

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 196 matching lines @@
         false,  /* is_signin_to_add */
         initial_auth_type,
         NULL,   /* public_session_recommended_locales */
         user_dict);
     users_list.Append(user_dict);
   }
 
   webui_handler_->LoadUsers(users_list, false);
 }
 
-void AppLaunchSigninScreen::CheckUserStatus(const AccountId& account_id) {}
+void AppLaunchSigninScreen::CheckUserStatus(const std::string& user_id) {
+}
 
 bool AppLaunchSigninScreen::IsUserWhitelisted(const std::string& user_id) {
   NOTREACHED();
   return true;
 }
 
 }  // namespace chromeos