Added browser test for existing user controller (new user login).

chrome/browser/chromeos/login/mock_user_manager.h

 // Copyright (c) 2010 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_MOCK_USER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_MOCK_USER_MANAGER_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace chromeos {
 
 class MockUserManager : public UserManager {
  public:
   MockUserManager() {}
   virtual ~MockUserManager() {}
 
   MOCK_CONST_METHOD0(GetUsers, std::vector<User>());
   MOCK_METHOD0(OffTheRecordUserLoggedIn, void());
   MOCK_METHOD1(UserLoggedIn, void(const std::string&));
   MOCK_METHOD1(RemoveUser, void(const std::string&));
   MOCK_METHOD1(IsKnownUser, bool(const std::string&));
-  MOCK_METHOD0(logged_in_user, const User&());
+  MOCK_CONST_METHOD0(logged_in_user, User());
   MOCK_METHOD0(current_user_is_owner, bool());
   MOCK_METHOD1(set_current_user_is_owner, void(bool));
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_MOCK_USER_MANAGER_H_