Fix AudioNode.disconnect() to support selective disconnection.

Source/modules/webaudio/AudioNode.h

Index: Source/modules/webaudio/AudioNode.h
diff --git a/Source/modules/webaudio/AudioNode.h b/Source/modules/webaudio/AudioNode.h
index 56a5e2904f6f31fead109e0f2838af0a56fb9a78..ad03746ceea76b7ea17e2d43e5d13edc13ab234a 100644
--- a/Source/modules/webaudio/AudioNode.h
+++ b/Source/modules/webaudio/AudioNode.h
@@ -138,7 +138,15 @@ public:
     // Called from main thread by corresponding JavaScript methods.
     virtual void connect(AudioNode*, unsigned outputIndex, unsigned inputIndex, ExceptionState&);
     void connect(AudioParam*, unsigned outputIndex, ExceptionState&);
+
+    virtual void disconnect();
     virtual void disconnect(unsigned outputIndex, ExceptionState&);
+    virtual void disconnect(AudioNode*, ExceptionState&);
+    virtual void disconnect(AudioNode*, unsigned outputIndex, ExceptionState&);
+    virtual void disconnect(AudioNode*, unsigned outputIndex, unsigned inputIndex, ExceptionState&);
+    virtual void disconnect(AudioParam*, ExceptionState&);
+    virtual void disconnect(AudioParam*, unsigned outputIndex, ExceptionState&);
+
     // Like disconnect, but no exception is thrown if the outputIndex is invalid.  Just do nothing
     // in that case.
     virtual void disconnectWithoutException(unsigned outputIndex);