diff --git a/core/lib/Drupal/Core/Routing/CompiledRoute.php b/core/lib/Drupal/Core/Routing/CompiledRoute.php
index 447366a..5fb1b4a 100644
--- a/core/lib/Drupal/Core/Routing/CompiledRoute.php
+++ b/core/lib/Drupal/Core/Routing/CompiledRoute.php
@@ -177,8 +177,7 @@ public function getRequirements() {
    * {@inheritdoc}
    */
   public function serialize() {
-    $data = unserialize(parent::serialize());
-
+    $data = [];
     // All symfony provided variables.
     // @todo A lot of them are actually not used by Drupal, at least for now,
     //   so think about optimize them out.
@@ -202,6 +201,8 @@ public function serialize() {
    * {@inheritdoc}
    */
   public function unserialize($serialized) {
+    parent::unserialize($serialized);
+
     $data = unserialize($serialized);
 
     $this->fit = $data['fit'];
diff --git a/core/lib/Drupal/Core/Routing/RouteProvider.php b/core/lib/Drupal/Core/Routing/RouteProvider.php
index 23a18a9..58597c1 100644
--- a/core/lib/Drupal/Core/Routing/RouteProvider.php
+++ b/core/lib/Drupal/Core/Routing/RouteProvider.php
@@ -347,13 +347,4 @@ public function getRoutesCount() {
     return $this->connection->query("SELECT COUNT(*) FROM {" . $this->connection->escapeTable($this->tableName) . "}")->fetchField();
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function getRoutesByNameAsCollection($names) {
-    $route_strings = $this->getRoutesByNames($names, FALSE);
-
-    return new LazyUnserializingRouteCollection($route_strings);
-  }
-
 }