Add a Drupal-overriding UrlMatcher Final Matcher.

core/lib/Drupal/Core/Routing/UrlMatcher.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Drupal\Core\Routing;
+
+use Symfony\Cmf\Component\Routing\NestedMatcher\UrlMatcher as BaseUrlMatcher;
+
+/**
+ * Description of UrlMatcher
+ *
+ * @author crell
+ */
+class UrlMatcher extends BaseUrlMatcher {
+
+  public function finalMatch(RouteCollection $collection, Request $request) {
+    $this->routes = $collection;
+    $context = new RequestContext();
+    $context->fromRequest($request);
+    $this->setContext($context);
+    return $this->match($request->attributes->get('system_path'));
+  }
+
+}