Remove [NoInterfaceObject] from several WebAudio IDL interfaces

Source/modules/webaudio/OscillatorNode.idl

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
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  *    notice, this list of conditions and the following disclaimer.
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 // OscillatorNode is an audio generator of periodic waveforms.
 [
-    NoInterfaceObject,
     Conditional=WEB_AUDIO
 ] interface OscillatorNode : AudioSourceNode {
 
     // Type constants.
     const unsigned short SINE = 0;
     const unsigned short SQUARE = 1;
     const unsigned short SAWTOOTH = 2;
     const unsigned short TRIANGLE = 3;
     const unsigned short CUSTOM = 4;
 
@@ skipping 12 matching lines @@
 
     void start(double when);
     void stop(double when);
 
     void noteOn(double when);
     void noteOff(double when);
 
     void setWaveTable(WaveTable waveTable);
 
 };