MDL-14898 upgraded html purifier to 3.1.0 in HEAD

lib/htmlpurifier/HTMLPurifier/AttrDef/HTML/MultiLength.php

@@ -1,8 +1,5 @@
 <?php
 
-require_once 'HTMLPurifier/AttrDef.php';
-require_once 'HTMLPurifier/AttrDef/HTML/Length.php';
-
 /**
  * Validates a MultiLength as defined by the HTML spec.
  * 
@@ -12,7 +9,7 @@ require_once 'HTMLPurifier/AttrDef/HTML/Length.php';
 class HTMLPurifier_AttrDef_HTML_MultiLength extends HTMLPurifier_AttrDef_HTML_Length
 {
     
-    function validate($string, $config, &$context) {
+    public function validate($string, $config, $context) {
         
         $string = trim($string);
         if ($string === '') return false;