Removed useless use statement

Author: stof

src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php

@@ -12,7 +12,6 @@
 namespace Symfony\Bridge\Doctrine\Security\User;
 
 use Doctrine\Common\Persistence\ManagerRegistry;
-use Doctrine\Common\Persistence\ObjectManager;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
 use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\User\UserProviderInterface;