diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index a3ae42d05aceb1d0e6f369b39548f485813c5c26..bc36c15fc087dbb3ff78237fb0099b77d2daf395 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -229,9 +229,9 @@ public static function createFromRequest(Request $request, $class_loader, $envir
 
     // Initialize our list of trusted HTTP Host headers to protect against
     // header attacks.
-    $hostPatterns = Settings::get('trusted_host_patterns', array());
-    if (PHP_SAPI !== 'cli' && !empty($hostPatterns)) {
-      if (static::setupTrustedHosts($request, $hostPatterns) === FALSE) {
+    $host_patterns = Settings::get('trusted_host_patterns', array());
+    if (PHP_SAPI !== 'cli' && !empty($host_patterns)) {
+      if (static::setupTrustedHosts($request, $host_patterns) === FALSE) {
         throw new BadRequestHttpException('The provided host name is not valid for this server.');
       }
     }
@@ -1270,7 +1270,7 @@ public static function validateHostname(Request $request) {
    *
    * @param \Symfony\Component\HttpFoundation\Request $request
    *   The request object.
-   * @param array $hostPatterns
+   * @param array $host_patterns
    *   The array of trusted host patterns.
    *
    * @return boolean
@@ -1278,8 +1278,8 @@ public static function validateHostname(Request $request) {
    *
    * @see https://www.drupal.org/node/1992030
    */
-  protected static function setupTrustedHosts(Request $request, $hostPatterns) {
-    $request->setTrustedHosts($hostPatterns);
+  protected static function setupTrustedHosts(Request $request, $host_patterns) {
+    $request->setTrustedHosts($host_patterns);
 
     // Get the host, which will validate the current request.
     try {
diff --git a/sites/example.settings.local.php b/sites/example.settings.local.php
index 3d5857a306b356158793eb72e131e983e5ad3aef..7859fe5021951e9a393204ae347e5a690f440f9b 100644
--- a/sites/example.settings.local.php
+++ b/sites/example.settings.local.php
@@ -55,15 +55,3 @@
  * using these parameters in a request to rebuild.php.
  */
 $settings['rebuild_access'] = TRUE;
-
-/**
- * Trust localhost.
- *
- * This will configure several common hostnames used for local development to
- * be trusted hosts.
- */
-$settings['trusted_host_patterns'] = array(
-  '^localhost$',
-  '^localhost\.*',
-  '\.local$',
-);