diff --git a/core/includes/common.inc b/core/includes/common.inc
index 409fa67..ec9d58c 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -1069,40 +1069,6 @@ function drupal_clear_css_cache() {
 }
 
 /**
- * Prepares a string for use as a valid HTML ID and guarantees uniqueness.
- *
- * This function ensures that each passed HTML ID value only exists once on the
- * page. By tracking the already returned ids, this function enables forms,
- * blocks, and other content to be output multiple times on the same page,
- * without breaking (X)HTML validation.
- *
- * For already existing IDs, a counter is appended to the ID string. Therefore,
- * JavaScript and CSS code should not rely on any value that was generated by
- * this function and instead should rely on manually added CSS classes or
- * similarly reliable constructs.
- *
- * Two consecutive hyphens separate the counter from the original ID. To manage
- * uniqueness across multiple Ajax requests on the same page, Ajax requests
- * POST an array of all IDs currently present on the page, which are used to
- * prime this function's cache upon first invocation.
- *
- * To allow reverse-parsing of IDs submitted via Ajax, any multiple consecutive
- * hyphens in the originally passed $id are replaced with a single hyphen.
- *
- * @param $id
- *   The ID to clean.
- *
- * @return
- *   The cleaned ID.
- *
- * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.0.
- *   Use \Drupal\Component\Utility\Html::getUniqueId()
- */
-function drupal_html_id($id) {
-  return Html::getUniqueId($id);
-}
-
-/**
  * Prepares a string for use as a valid HTML ID.
  *
  * Only use this function when you want to intentionally skip the uniqueness