Remove _relocate_children(), which has had no purpose for some time.

props SergeyBiryukov, scribu.
fixes #19367.


git-svn-id: https://develop.svn.wordpress.org/trunk@27261 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/deprecated.php

@@ -1174,3 +1174,17 @@ function wp_dashboard_recent_comments_control() {}
 function wp_dashboard_secondary() {}
 function wp_dashboard_secondary_control() {}
 /**#@-*/
+
+/**
+ * This was once used to move child posts to a new parent.
+ *
+ * @since 2.3.0
+ * @deprecated 3.9.0
+ * @access private
+ *
+ * @param int $old_ID
+ * @param int $new_ID
+ */
+function _relocate_children( $old_ID, $new_ID ) {
+	_deprecated_function( __FUNCTION__, '3.9' );
+}