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

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

Index: client/dom/generated/src/frog/HTMLOptionElement.dart
diff --git a/client/dom/generated/src/frog/HTMLOptionElement.dart b/client/dom/generated/src/frog/HTMLOptionElement.dart
index d40e4ee06bff011a6b69a3139a223281516fc0ad..fd17559b9af9e44fe14be8a9c18bf883048689e3 100644
--- a/client/dom/generated/src/frog/HTMLOptionElement.dart
+++ b/client/dom/generated/src/frog/HTMLOptionElement.dart
@@ -1,31 +1,19 @@
 
 class _HTMLOptionElementJs extends _HTMLElementJs implements HTMLOptionElement native "*HTMLOptionElement" {
 
-  bool get defaultSelected() native "return this.defaultSelected;";
+  bool defaultSelected;
 
-  void set defaultSelected(bool value) native "this.defaultSelected = value;";
+  bool disabled;
 
-  bool get disabled() native "return this.disabled;";
+  final _HTMLFormElementJs form;
 
-  void set disabled(bool value) native "this.disabled = value;";
+  final int index;
 
-  _HTMLFormElementJs get form() native "return this.form;";
+  String label;
 
-  int get index() native "return this.index;";
+  bool selected;
 
-  String get label() native "return this.label;";
+  String text;
 
-  void set label(String value) native "this.label = value;";
-
-  bool get selected() native "return this.selected;";
-
-  void set selected(bool value) native "this.selected = value;";
-
-  String get text() native "return this.text;";
-
-  void set text(String value) native "this.text = value;";
-
-  String get value() native "return this.value;";
-
-  void set value(String value) native "this.value = value;";
+  String value;
 }