diff --git a/core/lib/Drupal/Core/Extension/ExtensionDiscovery.php b/core/lib/Drupal/Core/Extension/ExtensionDiscovery.php
index f3afb38..d77a11f 100644
--- a/core/lib/Drupal/Core/Extension/ExtensionDiscovery.php
+++ b/core/lib/Drupal/Core/Extension/ExtensionDiscovery.php
@@ -237,7 +237,7 @@ public function setProfileDirectories(array $paths = NULL) {
   }
 
   /**
-   * Filters out extensions not belonging to the current installation profiles.
+   * Filters out extensions not belonging to the scanned installation profiles.
    *
    * @param \Drupal\Core\Extension\Extension[] $all_files.
    *   The list of all extensions.
@@ -245,12 +245,12 @@ public function setProfileDirectories(array $paths = NULL) {
    * @return \Drupal\Core\Extension\Extension[]
    *   The filtered list of extensions.
    */
-  protected function filter(array $all_files) {
+  protected function filterByProfileDirectories(array $all_files) {
     if (empty($this->profileDirectories)) {
       return $all_files;
     }
 
-    $all_files = array_filter($all_files, function($file) {
+    $all_files = array_filter($all_files, function ($file) {
       if (strpos($file->subpath, 'profiles') !== 0) {
         // This extension doesn't belong to a profile, ignore it.
         return TRUE;
@@ -274,11 +274,13 @@ protected function filter(array $all_files) {
    *
    * @param \Drupal\Core\Extension\Extension[] $all_files.
    *   The list of all extensions.
+   * @param array $weights
+   *   An array of weights, keyed by originating directory.
    *
    * @return \Drupal\Core\Extension\Extension[]
    *   The sorted list of extensions.
    */
-  protected function sort(array $all_files, $weights) {
+  protected function sort(array $all_files, array $weights) {
     $origins = array();
     $profiles = array();
     foreach ($all_files as $key => $file) {