Use 'field' syntax in dart:dom interfaces.

client/dom/generated/src/interface/AudioListener.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 AudioListener {
 
-  num get dopplerFactor();
+  num dopplerFactor;
 
-  void set dopplerFactor(num value);
-
-  num get speedOfSound();
-
-  void set speedOfSound(num value);
+  num speedOfSound;
 
   void setOrientation(num x, num y, num z, num xUp, num yUp, num zUp);
 
   void setPosition(num x, num y, num z);
 
   void setVelocity(num x, num y, num z);
 }