diff --git a/core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php b/core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php
index a5a0ad3a840cc4587f33abb53e0507a36def50f5..a697a0c1c318ed215546f552471ae6699f6b689c 100644
--- a/core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php
+++ b/core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php
@@ -20,20 +20,6 @@
  */
 class LibraryDiscoveryCollector extends CacheCollector {
 
-  /**
-   * The cache backend.
-   *
-   * @var \Drupal\Core\Cache\CacheBackendInterface
-   */
-  protected $cache;
-
-  /**
-   * The lock backend.
-   *
-   * @var \Drupal\Core\Lock\LockBackendInterface
-   */
-  protected $lock;
-
   /**
    * The library discovery parser.
    *