Disable repeated signin as manager.

chrome/browser/ui/webui/chromeos/login/supervised_user_creation_screen_handler.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/ui/webui/chromeos/login/supervised_user_creation_screen_handler.h"
 
 #include "ash/audio/sounds.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/login/screens/user_selection_screen.h"
@@ skipping 368 matching lines @@
       IDS_CREATE_SUPERVISED_USER_CREATION_CREATION_PROGRESS_MESSAGE));
 
   delegate_->ImportSupervisedUserWithPassword(user_id, password);
 }
 
 void SupervisedUserCreationScreenHandler::HandleAuthenticateManager(
     const std::string& raw_manager_username,
     const std::string& manager_password) {
   const std::string manager_username =
       gaia::SanitizeEmail(raw_manager_username);
-
-  UserFlow* flow = new SupervisedUserCreationFlow(manager_username);
-  ChromeUserManager::Get()->SetUserFlow(manager_username, flow);
-
   delegate_->AuthenticateManager(manager_username, manager_password);
 }
 
 // TODO(antrim) : this is an explicit code duplications with UserImageScreen.
 // It should be removed by issue 251179.
 void SupervisedUserCreationScreenHandler::HandleGetImages() {
   base::ListValue image_urls;
   for (int i = user_manager::kFirstDefaultImageIndex;
        i < user_manager::kDefaultImagesCount;
        ++i) {
@@ skipping 56 matching lines @@
 void SupervisedUserCreationScreenHandler::SetCameraPresent(bool present) {
   CallJS("setCameraPresent", present);
 }
 
 void SupervisedUserCreationScreenHandler::ShowExistingSupervisedUsers(
     const base::ListValue* users) {
   CallJS("setExistingSupervisedUsers", *users);
 }
 
 }  // namespace chromeos