Revert of WebAudio: Remove AudioNode::RefType.

Source/modules/webaudio/AudioBufferSourceNode.cpp

 /*
  * 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 44 matching lines @@
 AudioBufferSourceNode::AudioBufferSourceNode(AudioContext* context, float sampleRate)
     : AudioScheduledSourceNode(context, sampleRate)
     , m_buffer(nullptr)
     , m_isLooping(false)
     , m_loopStart(0)
     , m_loopEnd(0)
     , m_virtualReadIndex(0)
     , m_isGrain(false)
     , m_grainOffset(0.0)
     , m_grainDuration(DefaultGrainDuration)
+    , m_pannerNode(0)
 {
     ScriptWrappable::init(this);
     setNodeType(NodeTypeAudioBufferSource);
 
     m_playbackRate = AudioParam::create(context, "playbackRate", 1.0, 0.0, MaxRate);
 
     // Default to mono. A call to setBuffer() will set the number of output
     // channels to that of the buffer.
     addOutput(AudioNodeOutput::create(this, 1));
 
@@ skipping 367 matching lines @@
 }
 
 bool AudioBufferSourceNode::propagatesSilence() const
 {
     return !isPlayingOrScheduled() || hasFinished() || !m_buffer;
 }
 
 void AudioBufferSourceNode::setPannerNode(PannerNode* pannerNode)
 {
     if (m_pannerNode != pannerNode && !hasFinished()) {
-        RefPtr<PannerNode> oldPannerNode(m_pannerNode.release());
+        if (pannerNode)
+            pannerNode->ref(AudioNode::RefTypeConnection);
+        if (m_pannerNode)
+            m_pannerNode->deref(AudioNode::RefTypeConnection);
+
         m_pannerNode = pannerNode;
-        if (pannerNode)
-            pannerNode->makeConnection();
-        if (oldPannerNode)
-            oldPannerNode->breakConnection();
     }
 }
 
 void AudioBufferSourceNode::clearPannerNode()
 {
     if (m_pannerNode) {
-        m_pannerNode->breakConnection();
-        m_pannerNode.clear();
+        m_pannerNode->deref(AudioNode::RefTypeConnection);
+        m_pannerNode = 0;
     }
 }
 
 void AudioBufferSourceNode::finish()
 {
     clearPannerNode();
     ASSERT(!m_pannerNode);
     AudioScheduledSourceNode::finish();
 }
 
 void AudioBufferSourceNode::trace(Visitor* visitor)
 {
     visitor->trace(m_buffer);
     visitor->trace(m_playbackRate);
     AudioScheduledSourceNode::trace(visitor);
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)