fixed CS

Author: fabpot

src/Symfony/Bundle/SecurityBundle/DependencyInjection/Compiler/AddSessionDomainConstraintPass.php

@@ -11,7 +11,6 @@
 
 namespace Symfony\Bundle\SecurityBundle\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;