Update message "Render %s callbacks must be methods of a class that implements" with attribute

Closes #3436803

core/lib/Drupal/Core/Access/RouteProcessorCsrf.php

@@ -4,15 +4,14 @@
 
 use Drupal\Component\Utility\Crypt;
 use Drupal\Core\Render\BubbleableMetadata;
-use Drupal\Core\Security\TrustedCallbackInterface;
 use Drupal\Core\RouteProcessor\OutboundRouteProcessorInterface;
 use Symfony\Component\Routing\Route;
+use Drupal\Core\Security\Attribute\TrustedCallback;
 
 /**
  * Processes the outbound route to handle the CSRF token.
  */
-class RouteProcessorCsrf implements OutboundRouteProcessorInterface, TrustedCallbackInterface {
-
+class RouteProcessorCsrf implements OutboundRouteProcessorInterface {
   /**
    * The CSRF token generator.
    *
@@ -70,6 +69,7 @@ public function processOutbound($route_name, Route $route, array &$parameters, B
    * @return array
    *   A renderable array representing the CSRF token.
    */
+  #[TrustedCallback]
   public function renderPlaceholderCsrfToken($path) {
     return [
       '#markup' => $this->csrfToken->get($path),
@@ -82,11 +82,4 @@ public function renderPlaceholderCsrfToken($path) {
     ];
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public static function trustedCallbacks() {
-    return ['renderPlaceholderCsrfToken'];
-  }
-
 }