Update IDL to Chrome 32

modules/webaudio/AudioContext.idl

Index: modules/webaudio/AudioContext.idl
diff --git a/modules/webaudio/AudioContext.idl b/modules/webaudio/AudioContext.idl
index d1100f535e6eac4746bfda98dd68350becae3923..f14e8b6e551d3a211aae303711686287df4a5cb2 100644
--- a/modules/webaudio/AudioContext.idl
+++ b/modules/webaudio/AudioContext.idl
@@ -27,7 +27,10 @@
     NoInterfaceObject,
     Conditional=WEB_AUDIO,
     ActiveDOMObject,
-    CustomConstructor
+    Constructor,
+    Constructor(unsigned long numberOfChannels, unsigned long numberOfFrames, float sampleRate),
+    ConstructorCallWith=Document,
+    ConstructorRaisesException
 ] interface AudioContext : EventTarget {
     // All rendered audio ultimately connects to destination, which represents the audio hardware.
     readonly attribute AudioDestinationNode destination;
@@ -67,7 +70,7 @@
     ConvolverNode createConvolver();
     DynamicsCompressorNode createDynamicsCompressor();
     AnalyserNode createAnalyser();
-    [RaisesException] ScriptProcessorNode createScriptProcessor(unsigned long bufferSize, optional unsigned long numberOfInputChannels, optional unsigned long numberOfOutputChannels);
+    [RaisesException] ScriptProcessorNode createScriptProcessor(optional unsigned long bufferSize, optional unsigned long numberOfInputChannels, optional unsigned long numberOfOutputChannels);
     OscillatorNode createOscillator();
     [RaisesException] PeriodicWave createPeriodicWave(Float32Array real, Float32Array imag);