Add support for [NoInterfaceObject] extended attribute to bindings generator

Source/modules/webaudio/BiquadFilterNode.idl

 /*
  * Copyright (C) 2011, Google Inc. All rights reserved.
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  * Redistribution and use in source and binary forms, with or without
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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 [
+    NoInterfaceObject,
     Conditional=WEB_AUDIO
 ] interface BiquadFilterNode : AudioNode {
     // Filter type.
     const unsigned short LOWPASS = 0;
     const unsigned short HIGHPASS = 1;
     const unsigned short BANDPASS = 2;
     const unsigned short LOWSHELF = 3;
     const unsigned short HIGHSHELF = 4;
     const unsigned short PEAKING = 5;
     const unsigned short NOTCH = 6;
     const unsigned short ALLPASS = 7;
 
     [CustomSetter] attribute DOMString type;
     
     readonly attribute AudioParam frequency; // in Hertz
     readonly attribute AudioParam detune; // in Cents
     readonly attribute AudioParam Q; // Quality factor
     readonly attribute AudioParam gain; // in Decibels
 
     void getFrequencyResponse(Float32Array frequencyHz,
                               Float32Array magResponse,
                               Float32Array phaseResponse);
 };