reverted:
--- b/google_analytics.module
+++ a/google_analytics.module
@@ -21,7 +21,6 @@
 use Drupal\Core\Url;
 use Drupal\node\NodeInterface;
 use GuzzleHttp\Exception\RequestException;
-use Drupal\Core\File\FileSystem;
 
 /**
  * Define the default file extension list that should be tracked as download.
@@ -529,7 +528,7 @@
   $path = 'public://google_analytics';
   if (file_prepare_directory($path)) {
     file_scan_directory($path, '/.*/', ['callback' => 'file_unmanaged_delete']);
+    drupal_rmdir($path);
-    FileSystem::rmdir($path);
 
     // Change query-strings on css/js files to enforce reload for all users.
     _drupal_flush_css_js();