[WebProfilerBundle] Add missing use statement.

Request is needed in RouterController::getTraces to be able to create a request.

Author: camporter

src/Symfony/Bundle/WebProfilerBundle/Controller/RouterController.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\WebProfilerBundle\Controller;
 
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
 use Symfony\Component\Routing\Matcher\TraceableUrlMatcher;