Get rid of Element#classList in the wrapperless DOM.

client/html/frog/html_frog.dart

Index: client/html/frog/html_frog.dart
diff --git a/client/html/frog/html_frog.dart b/client/html/frog/html_frog.dart
index d9e6f4f2724fccb76cdf28ea479abc8a5b11883e..2855c1a0a07ea2c8760b1211dca90844d65d1199 100644
--- a/client/html/frog/html_frog.dart
+++ b/client/html/frog/html_frog.dart
@@ -5431,8 +5431,6 @@ class _ElementImpl extends _NodeImpl implements Element native "*Element" {
 
   _HTMLCollectionImpl get _children() native "return this.children;";
 
-  final _DOMTokenListImpl classList;
-
   String get _className() native "return this.className;";
 
   void set _className(String value) native "this.className = value;";
@@ -20365,8 +20363,6 @@ interface Element extends Node, NodeSelector default _ElementFactoryProvider {
 
   final HTMLCollection _children;
 
-  final DOMTokenList classList;
-
   String _className;
 
   final int _clientHeight;