[cros] user_manager component - move UserManagerBase and UserManager

chrome/browser/chromeos/login/users/remove_user_delegate.h

-// 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_LOGIN_USERS_REMOVE_USER_DELEGATE_H_
-#define CHROME_BROWSER_CHROMEOS_LOGIN_USERS_REMOVE_USER_DELEGATE_H_
-
-namespace chromeos {
-
-// Delegate to be used with |UserManager::RemoveUser|.
-class RemoveUserDelegate {
- public:
-  // Called right before actual user removal process is initiated.
-  virtual void OnBeforeUserRemoved(const std::string& username) = 0;
-
-  // Called right after user removal process has been initiated.
-  virtual void OnUserRemoved(const std::string& username) = 0;
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USERS_REMOVE_USER_DELEGATE_H_