Resolve #3534988 "Upgrade web push libs web push php"

Closes #3534988

src/Controller/WebPushController.php

@@ -5,8 +5,6 @@ namespace Drupal\web_push\Controller;
 use Drupal\Core\Cache\CacheableResponse;
 use Drupal\Core\Controller\ControllerBase;
 use Drupal\Core\Extension\ModuleHandler;
-use Drupal\Core\Url;
-use Drupal\web_push\Form\SettingsForm;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
@@ -17,6 +15,8 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
 class WebPushController extends ControllerBase {
 
   /**
+   * The module handler service.
+   *
    * @var \Drupal\Core\Extension\ModuleHandler
    */
   protected $moduleHandler;
@@ -40,12 +40,11 @@ class WebPushController extends ControllerBase {
     );
   }
 
-
   /**
    * Get the service worker javascript handler.
    *
    * @return \Drupal\Core\Cache\CacheableResponse
-   *  The service worker content.
+   *   The service worker content.
    */
   public function serviceWorker() {
     // Get the actual module path.
@@ -57,9 +56,7 @@ class WebPushController extends ControllerBase {
       'Content-Type' => 'application/javascript',
       'Service-Worker-Allowed' => '/',
     ]);
-    // TODO add cache metadata
-    // $response->addCacheableDependency($cacheable_metadata);
-
+    // @todo add cache metadata
     return $response;
   }