Rather than removing the 3rd argument in `WP_Object_Cache::delete()`, mark it as `$deprecated`.

See [27064].
Props SergeyBiryukov.
Fixes #22478.



git-svn-id: https://develop.svn.wordpress.org/trunk@27162 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/cache.php

@@ -389,17 +389,16 @@ class WP_Object_Cache {
 	 * Remove the contents of the cache key in the group
 	 *
 	 * If the cache key does not exist in the group, then nothing will happen.
-	 * There used to be a 3rd param (bool $force Optional. Whether to
-	 * force the unsetting of the cache key in the group).
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param int|string $key What the contents in the cache are called
 	 * @param string $group Where the cache contents are grouped
+	 * @param bool $deprecated Deprecated.
 	 *
 	 * @return bool False if the contents weren't deleted and true on success
 	 */
-	function delete( $key, $group = 'default' ) {
+	function delete( $key, $group = 'default', $deprecated = false ) {
 		if ( empty( $group ) )
 			$group = 'default';