Add support for [NoInterfaceObject] extended attribute to bindings generator

Source/modules/webaudio/AudioSourceNode.idl

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
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 [
+    NoInterfaceObject,
     Conditional=WEB_AUDIO,
     ImplementationLacksVTable
 ] interface AudioSourceNode : AudioNode {
 };