Index: wp-includes/cache.php
===================================================================
--- wp-includes/cache.php	(revision 21294)
+++ wp-includes/cache.php	(working copy)
@@ -70,12 +70,14 @@
  *
  * @param int|string $key What the contents in the cache are called
  * @param string $group Where the cache contents are grouped
+ * @param bool $force Optional. Whether to force the unsetting of the cache
+ *		key in the group
  * @return bool True on successful removal, false on failure
  */
-function wp_cache_delete($key, $group = '') {
+function wp_cache_delete($key, $group = '', $force = false) {
 	global $wp_object_cache;
 
-	return $wp_object_cache->delete($key, $group);
+	return $wp_object_cache->delete($key, $group, $force);
 }
 
 /**