Fix AudioNode.disconnect() to support selective disconnection.

Source/modules/webaudio/AudioNode.h

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 120 matching lines @@
 
     unsigned numberOfInputs() const { return m_inputs.size(); }
     unsigned numberOfOutputs() const { return m_outputs.size(); }
 
     AudioNodeInput* input(unsigned);
     AudioNodeOutput* output(unsigned);
 
     // 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);
 
     virtual float sampleRate() const { return m_sampleRate; }
 
     // processIfNecessary() is called by our output(s) when the rendering graph needs this AudioNode to process.
     // This method ensures that the AudioNode will only process once per rendering time quantum even if it's called repeatedly.
     // This handles the case of "fanout" where an output is connected to multiple AudioNode inputs.
     // Called from context's audio thread.
@@ skipping 86 matching lines @@
     ChannelCountMode m_channelCountMode;
     AudioBus::ChannelInterpretation m_channelInterpretation;
     // The new channel count mode that will be used to set the actual mode in the pre or post
     // rendering phase.
     ChannelCountMode m_newChannelCountMode;
 };
 
 } // namespace blink
 
 #endif // AudioNode_h