diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 9ce21ff..f3b8bb0 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1299,15 +1299,6 @@ function _template_preprocess_default_variables() {
 }
 
 /**
- * #pre_render callback for the html element type.
- *
- * @deprecated Use \Drupal\Core\Render\Element\Html::preRenderHtml().
- */
-function drupal_pre_render_html(array $element) {
-  return Element\Html::preRenderHtml($element);
-}
-
-/**
  * Prepares variables for HTML document templates.
  *
  * Default template: html.html.twig.