ISTWCMS-5544 Refactor add a warning message when deleting content

ISTWCMS-5544 Refactor using OO way to add a warning message when deleting content

src/EventSubscriber/UwDeleteFormEventSubscriber.php

@@ -6,6 +6,7 @@ use Drupal\Core\Session\AccountProxyInterface;
 use Drupal\core_event_dispatcher\Event\Form\FormAlterEvent;
 use Drupal\Core\StringTranslation\StringTranslationTrait;
 use Drupal\core_event_dispatcher\FormHookEvents;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
@@ -32,6 +33,16 @@ class UwDeleteFormEventSubscriber implements EventSubscriberInterface {
     $this->currentUser = $currentUser;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    // Instantiates this form class.
+    return new static(
+      $container->get('current_user'),
+    );
+  }
+
   /**
    * {@inheritdoc}
    */