Use fields in hidden native DOM classes instead of getters/setters.

client/dom/generated/src/frog/HTMLTableSectionElement.dart

Index: client/dom/generated/src/frog/HTMLTableSectionElement.dart
diff --git a/client/dom/generated/src/frog/HTMLTableSectionElement.dart b/client/dom/generated/src/frog/HTMLTableSectionElement.dart
index 383a3a195f6ebed299a58f75ae3591104b4413b4..c2abf31b6f9c339770b6fcc710363a2bf466f57c 100644
--- a/client/dom/generated/src/frog/HTMLTableSectionElement.dart
+++ b/client/dom/generated/src/frog/HTMLTableSectionElement.dart
@@ -1,23 +1,15 @@
 
 class _HTMLTableSectionElementJs extends _HTMLElementJs implements HTMLTableSectionElement native "*HTMLTableSectionElement" {
 
-  String get align() native "return this.align;";
+  String align;
 
-  void set align(String value) native "this.align = value;";
+  String ch;
 
-  String get ch() native "return this.ch;";
+  String chOff;
 
-  void set ch(String value) native "this.ch = value;";
+  final _HTMLCollectionJs rows;
 
-  String get chOff() native "return this.chOff;";
-
-  void set chOff(String value) native "this.chOff = value;";
-
-  _HTMLCollectionJs get rows() native "return this.rows;";
-
-  String get vAlign() native "return this.vAlign;";
-
-  void set vAlign(String value) native "this.vAlign = value;";
+  String vAlign;
 
   void deleteRow(int index) native;