user_manager component: Add UserManagerBase class.

chrome/browser/chromeos/login/users/fake_user_manager.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/chromeos/login/users/fake_user_manager.h"
 
 #include "chrome/browser/chromeos/login/users/fake_supervised_user_manager.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "components/user_manager/user_image/user_image.h"
 #include "components/user_manager/user_type.h"
@@ skipping 167 matching lines @@
 }
 
 const user_manager::UserList& FakeUserManager::GetLRULoggedInUsers() {
   return user_list_;
 }
 
 user_manager::UserList FakeUserManager::GetUnlockUsers() const {
   return user_list_;
 }
 
-const std::string& FakeUserManager::GetOwnerEmail() {
+const std::string& FakeUserManager::GetOwnerEmail() const {
   return owner_email_;
 }
 
 bool FakeUserManager::IsKnownUser(const std::string& email) const {
   return true;
 }
 
 const user_manager::User* FakeUserManager::FindUser(
     const std::string& email) const {
   const user_manager::UserList& users = GetUsers();
@@ skipping 99 matching lines @@
 
 UserFlow* FakeUserManager::GetUserFlow(const std::string& email) const {
   return NULL;
 }
 
 bool FakeUserManager::AreSupervisedUsersAllowed() const {
   return true;
 }
 
 }  // namespace chromeos