Added missing import of UserInterface.

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

@@ -15,6 +15,7 @@ use Doctrine\ORM\EntityManager;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
 use Symfony\Component\Security\Core\Exception\UsernameNotFoundException;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
+use Symfony\Component\Security\Core\User\UserInterface;
 
 /**
  * Wrapper around a Doctrine EntityManager.