Support 'Conditional' idl attribute.

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

 
 class _HTMLStyleElementJs extends _HTMLElementJs implements HTMLStyleElement native "*HTMLStyleElement" {
 
   bool get disabled() native "return this.disabled;";
 
   void set disabled(bool value) native "this.disabled = value;";
 
   String get media() native "return this.media;";
 
   void set media(String value) native "this.media = value;";
 
-  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;";
 }