Revert of 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 aafed1370709f0cabc55399a074da8d57368c263..82eddf0a424f15a5962270125d0395f50cb28a97 100644
--- a/Source/modules/webaudio/AudioNodeOutput.cpp
+++ b/Source/modules/webaudio/AudioNodeOutput.cpp
@@ -160,8 +160,6 @@
         return;
 
     m_inputs.add(input);
-    m_inputNodes.add(input->node());
-    input->node()->makeConnection();
 }
 
 void AudioNodeOutput::removeInput(AudioNodeInput* input)
@@ -173,8 +171,6 @@
         return;
 
     m_inputs.remove(input);
-    input->node()->breakConnection();
-    m_inputNodes.remove(input->node());
 }
 
 void AudioNodeOutput::disconnectAllInputs()