Support 'Conditional' idl attribute.

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

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
 
 interface HTMLStyleElement extends HTMLElement {
 
   bool get disabled();
 
   void set disabled(bool value);
 
   String get media();
 
   void set media(String value);
 
-  bool get scoped();
-
-  void set scoped(bool value);
-
   StyleSheet get sheet();
 
   String get type();
 
   void set type(String value);
 }