Remove [NoInterfaceObject] from several WebAudio IDL interfaces

Source/modules/webaudio/AudioBuffer.idl

 /*
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 [
-    NoInterfaceObject,
     Conditional=WEB_AUDIO,
     ImplementationLacksVTable
 ] interface AudioBuffer {
     readonly attribute long length; // in sample-frames
     readonly attribute float duration; // in seconds
     readonly attribute float sampleRate; // in sample-frames per second
 
     attribute float gain; // linear gain (default 1.0)
 
     // Channel access
     readonly attribute unsigned long numberOfChannels;
     [RaisesException] Float32Array getChannelData(unsigned long channelIndex);
 };