Fix AudioNode.disconnect() to support selective disconnection.

Source/modules/webaudio/AudioNode.idl

Index: Source/modules/webaudio/AudioNode.idl
diff --git a/Source/modules/webaudio/AudioNode.idl b/Source/modules/webaudio/AudioNode.idl
index 9623af7539c99b5116120f905b83461001e93685..56c3425a11ebfee09450f29ba0dadd994b6753aa 100644
--- a/Source/modules/webaudio/AudioNode.idl
+++ b/Source/modules/webaudio/AudioNode.idl
@@ -42,7 +42,13 @@ enum ChannelInterpretation {
 ] interface AudioNode : EventTarget {
     [RaisesException] void connect(AudioNode destination, optional unsigned long output = 0, optional unsigned long input = 0);
     [RaisesException] void connect(AudioParam destination, optional unsigned long output = 0);
-    [RaisesException] void disconnect(optional unsigned long output = 0);
+    void disconnect();
+    [RaisesException] void disconnect(unsigned long output);
+    [RaisesException] void disconnect(AudioNode destination);
+    [RaisesException] void disconnect(AudioNode destination, unsigned long output);
+    [RaisesException] void disconnect(AudioNode destination, unsigned long output, unsigned long input);
+    [RaisesException] void disconnect(AudioParam destination);
+    [RaisesException] void disconnect(AudioParam destination, unsigned long output);
     readonly attribute AudioContext  context;
     readonly attribute unsigned long numberOfInputs;
     readonly attribute unsigned long numberOfOutputs;