WebAudio: Remove AudioNode::RefType.

Source/modules/webaudio/AudioNodeOutput.cpp

Index: Source/modules/webaudio/AudioNodeOutput.cpp
diff --git a/Source/modules/webaudio/AudioNodeOutput.cpp b/Source/modules/webaudio/AudioNodeOutput.cpp
index 82eddf0a424f15a5962270125d0395f50cb28a97..49c56e4871d4ce0ed9226ffccf11ff56bf4cde11 100644
--- a/Source/modules/webaudio/AudioNodeOutput.cpp
+++ b/Source/modules/webaudio/AudioNodeOutput.cpp
@@ -160,6 +160,8 @@ void AudioNodeOutput::addInput(AudioNodeInput* input)
         return;
 
     m_inputs.add(input);
+    m_inputNodes.add(input->node());
+    input->node()->wasConnected();
 }
 
 void AudioNodeOutput::removeInput(AudioNodeInput* input)
@@ -171,6 +173,8 @@ void AudioNodeOutput::removeInput(AudioNodeInput* input)
         return;
 
     m_inputs.remove(input);
+    input->node()->willBeDisconnected();
+    m_inputNodes.remove(input->node());
 }
 
 void AudioNodeOutput::disconnectAllInputs()