diff --git a/core/modules/forum/src/ForumManagerInterface.php b/core/modules/forum/src/ForumManagerInterface.php
index 874ede7..89d836f 100644
--- a/core/modules/forum/src/ForumManagerInterface.php
+++ b/core/modules/forum/src/ForumManagerInterface.php
@@ -57,7 +57,7 @@ public function getIndex();
   public function resetCache();
 
   /**
-   * Protected function to wrap call to taxonomy_term_load_parents_all.
+   * Fetches the parent forums for a given forum.
    *
    * @param int $tid
    *   Term ID.
@@ -65,8 +65,8 @@ public function resetCache();
    * @return array
    *   Array of parent terms.
    *
-   * @todo remove and inject a service when taxonomy_term_get_parents_all has an
-   *   object-oriented equivalent.
+   * @deprecated Scheduled to be removed in 9.0.x, see
+   *   https://www.drupal.org/node/2371593.
    */
   public function getParents($tid);
 
diff --git a/core/modules/taxonomy/taxonomy.module b/core/modules/taxonomy/taxonomy.module
index 9df30d9..161a8e2 100644
--- a/core/modules/taxonomy/taxonomy.module
+++ b/core/modules/taxonomy/taxonomy.module
@@ -398,16 +398,6 @@ function taxonomy_term_load_parents($tid) {
 }
 
 /**
- * Find all ancestors of a given term ID.
- *
- * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
- *   Use \Drupal\taxonomy\TermStorageController::loadAllParents()
- */
-function taxonomy_term_load_parents_all($tid) {
-  return \Drupal::entityManager()->getStorage('taxonomy_term')->loadAllParents($tid);
-}
-
-/**
  * Finds all children of a term ID.
  *
  * @param $tid