diff --git a/core/includes/path.inc b/core/includes/path.inc
index 911cfe0..6b8eb8c 100644
--- a/core/includes/path.inc
+++ b/core/includes/path.inc
@@ -207,44 +207,17 @@ function drupal_valid_path($path, $dynamic_allowed = FALSE) {
       $item['options'] = '';
       _menu_link_translate($item);
     }
-    if (empty($item['access'])) {
-      // Nothing was found in the old routing system, so try the new one.
-      $item = _drupal_valid_path_new_router($path);
-    }
   }
   else {
     $item = menu_get_item($path);
-    if (empty($item['access'])) {
-      // Nothing was found in the old routing system, so try the new one.
-      $item = _drupal_valid_path_new_router($path);
-    }
+  }
+
+  // Check the new routing system.
+  if (!empty($item['route_name'])) {
+    $map = array();
+    $route = Drupal::service('router.route_provider')->getRouteByName($item['route_name']);
+    $item = menu_item_route_access($route, $path, $map);
   }
   $menu_admin = FALSE;
   return $item && $item['access'];
 }
-
-/**
- * Temporary helper function to check a path in the new routing system.
- *
- * @param string $path
- *   The path string as expected by drupal_valid_path().
- *
- * @return array|NULL
- *   An array containing 'access' => TRUE or NULL for paths that were not found
- *   or the user has no access to.
- */
-function _drupal_valid_path_new_router($path) {
-  $request = Request::create('/' . $path);
-  $request->attributes->set('system_path', $path);
-  try {
-    $dc = drupal_container();
-    $route = $dc->get('router.dynamic')->matchRequest($request);
-    if (!empty($route)) {
-      $dc->get('access_manager')->check($route['_route_object'], $request);
-    }
-    return array('access' => TRUE);
-  }
-  catch (Exception $e) {
-    drupal_set_message($e->getMessage(), 'menu', WATCHDOG_ERROR);
-  }
-}