diff --git a/core/modules/system/tests/modules/theme_test/lib/Drupal/theme_test/ThemeTestController.php b/core/modules/system/tests/modules/theme_test/lib/Drupal/theme_test/ThemeTestController.php
index 44a7668..583793e 100644
--- a/core/modules/system/tests/modules/theme_test/lib/Drupal/theme_test/ThemeTestController.php
+++ b/core/modules/system/tests/modules/theme_test/lib/Drupal/theme_test/ThemeTestController.php
@@ -8,19 +8,11 @@
 namespace Drupal\theme_test;
 
 use Drupal\Core\Controller\ControllerInterface;
-use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Controller routines for theme test routes.
  */
-class ThemeTestController implements ControllerInterface {
-
-  /**
-   * {@inheritdoc}
-   */
-  public static function create(ContainerInterface $container) {
-    return new static();
-  }
+class ThemeTestController {
 
   /**
    * Menu callback for testing that a theme template overrides a theme function.
@@ -41,14 +33,18 @@ public function functionTemplateOverridden() {
    */
   public function infoStylesheets() {
     $path = drupal_get_path('module', 'theme_test');
-    $render_array = array();
-    $render_array['#attached']['css'][] = "$path/css/base-override.css";
-    $render_array['#attached']['css'][] = "$path/css/base-override.sub-remove.css";
-    $render_array['#attached']['css'][] = "$path/css/base-remove.css";
-    $render_array['#attached']['css'][] = "$path/css/base-remove.sub-override.css";
-    $render_array['#attached']['css'][] = "$path/css/sub-override.css";
-    $render_array['#attached']['css'][] = "$path/css/sub-remove.css";
-    return $render_array;
+    return array(
+      '#attached' => array(
+        'css' => array(
+          "$path/css/base-override.css",
+          "$path/css/base-override.sub-remove.css",
+          "$path/css/base-remove.css",
+          "$path/css/base-remove.sub-override.css",
+          "$path/css/sub-override.css",
+          "$path/css/sub-remove.css",
+        ),
+      ),
+    );
   }
   /**
    * Tests template overridding based on filename.