New version of dart:html

client/html/generated/src/wrapping/_CSSStyleSheetWrappingImplementation.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
 
 class CSSStyleSheetWrappingImplementation extends StyleSheetWrappingImplementation implements CSSStyleSheet {
   CSSStyleSheetWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
   CSSRuleList get cssRules() { return LevelDom.wrapCSSRuleList(_ptr.cssRules); }
 
   CSSRule get ownerRule() { return LevelDom.wrapCSSRule(_ptr.ownerRule); }
 
   CSSRuleList get rules() { return LevelDom.wrapCSSRuleList(_ptr.rules); }
 
-  int addRule(String selector, String style, [int index = null]) {
+  int addRule(String selector, String style, [int index]) {
     if (index === null) {
       return _ptr.addRule(selector, style);
     } else {
       return _ptr.addRule(selector, style, index);
     }
   }
 
   void deleteRule(int index) {
     _ptr.deleteRule(index);
     return;
   }
 
   int insertRule(String rule, int index) {
     return _ptr.insertRule(rule, index);
   }
 
   void removeRule(int index) {
     _ptr.removeRule(index);
     return;
   }
 }