[Security] Remove duplicated namespace in SwitchUserListener

src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php

@@ -17,7 +17,6 @@ use Symfony\Component\Security\Core\User\UserCheckerInterface;
 use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
 use Symfony\Component\HttpKernel\Log\LoggerInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
-use Symfony\Component\HttpKernel\Events;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\RedirectResponse;