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

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

Index: client/dom/generated/src/frog/HTMLStyleElement.dart
diff --git a/client/dom/generated/src/frog/HTMLStyleElement.dart b/client/dom/generated/src/frog/HTMLStyleElement.dart
index 1f6e5b3742e6603339c7ca79bb5f622e7d59f7ab..ab3ad2bf0ae1eb461dd9e0d514db1ed24dd382f7 100644
--- a/client/dom/generated/src/frog/HTMLStyleElement.dart
+++ b/client/dom/generated/src/frog/HTMLStyleElement.dart
@@ -1,21 +1,13 @@
 
 class _HTMLStyleElementJs extends _HTMLElementJs implements HTMLStyleElement native "*HTMLStyleElement" {
 
-  bool get disabled() native "return this.disabled;";
+  bool disabled;
 
-  void set disabled(bool value) native "this.disabled = value;";
+  String media;
 
-  String get media() native "return this.media;";
+  bool scoped;
 
-  void set media(String value) native "this.media = value;";
+  final _StyleSheetJs sheet;
 
-  bool get scoped() native "return this.scoped;";
-
-  void set scoped(bool value) native "this.scoped = value;";
-
-  _StyleSheetJs get sheet() native "return this.sheet;";
-
-  String get type() native "return this.type;";
-
-  void set type(String value) native "this.type = value;";
+  String type;
 }