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

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

 
 class _HTMLScriptElementJs extends _HTMLElementJs implements HTMLScriptElement native "*HTMLScriptElement" {
 
-  bool get async() native "return this.async;";
+  bool async;
 
-  void set async(bool value) native "this.async = value;";
+  String charset;
 
-  String get charset() native "return this.charset;";
+  bool defer;
 
-  void set charset(String value) native "this.charset = value;";
+  String event;
 
-  bool get defer() native "return this.defer;";
+  String htmlFor;
 
-  void set defer(bool value) native "this.defer = value;";
+  String src;
 
-  String get event() native "return this.event;";
+  String text;
 
-  void set event(String value) native "this.event = value;";
-
-  String get htmlFor() native "return this.htmlFor;";
-
-  void set htmlFor(String value) native "this.htmlFor = value;";
-
-  String get src() native "return this.src;";
-
-  void set src(String value) native "this.src = value;";
-
-  String get text() native "return this.text;";
-
-  void set text(String value) native "this.text = value;";
-
-  String get type() native "return this.type;";
-
-  void set type(String value) native "this.type = value;";
+  String type;
 }