WebAudio: Remove AudioNode::RefType.

Source/modules/webaudio/AudioBufferSourceNode.cpp

Index: Source/modules/webaudio/AudioBufferSourceNode.cpp
diff --git a/Source/modules/webaudio/AudioBufferSourceNode.cpp b/Source/modules/webaudio/AudioBufferSourceNode.cpp
index dc55f76d4d63b8a2b3f37d39d48124071619c55b..67b6e38b64cdb0200929ae500a72e848a1657589 100644
--- a/Source/modules/webaudio/AudioBufferSourceNode.cpp
+++ b/Source/modules/webaudio/AudioBufferSourceNode.cpp
@@ -64,7 +64,6 @@ AudioBufferSourceNode::AudioBufferSourceNode(AudioContext* context, float sample
     , m_isGrain(false)
     , m_grainOffset(0.0)
     , m_grainDuration(DefaultGrainDuration)
-    , m_pannerNode(0)
 {
     ScriptWrappable::init(this);
     setNodeType(NodeTypeAudioBufferSource);
@@ -452,20 +451,20 @@ bool AudioBufferSourceNode::propagatesSilence() const
 void AudioBufferSourceNode::setPannerNode(PannerNode* pannerNode)
 {
     if (m_pannerNode != pannerNode && !hasFinished()) {
-        if (pannerNode)
-            pannerNode->ref(AudioNode::RefTypeConnection);
-        if (m_pannerNode)
-            m_pannerNode->deref(AudioNode::RefTypeConnection);
-
+        RefPtr<PannerNode> oldPannerNode(m_pannerNode.release());
         m_pannerNode = pannerNode;
+        if (pannerNode)
+            pannerNode->wasConnected();
+        if (oldPannerNode)
+            oldPannerNode->willBeDisconnected();
     }
 }
 
 void AudioBufferSourceNode::clearPannerNode()
 {
     if (m_pannerNode) {
-        m_pannerNode->deref(AudioNode::RefTypeConnection);
-        m_pannerNode = 0;
+        m_pannerNode->willBeDisconnected();
+        m_pannerNode.clear();
     }
 }