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 f0abe553f0de66f8fcc6bb9200a0f0feb28314d1..ece7407abbbd4f8dfdd6abf5cb509d2e6d026bcf 100644
--- a/Source/modules/webaudio/AudioBufferSourceNode.cpp
+++ b/Source/modules/webaudio/AudioBufferSourceNode.cpp
@@ -62,7 +62,6 @@ AudioBufferSourceNode::AudioBufferSourceNode(AudioContext* context, float sample
     , m_isGrain(false)
     , m_grainOffset(0.0)
     , m_grainDuration(DefaultGrainDuration)
-    , m_pannerNode(0)
 {
     ScriptWrappable::init(this);
     setNodeType(NodeTypeAudioBufferSource);
@@ -450,20 +449,20 @@ 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->makeConnection();
+        if (oldPannerNode)
+            oldPannerNode->breakConnection();
     }
 }
 
 void AudioBufferSourceNode::clearPannerNode()
 {
     if (m_pannerNode) {
-        m_pannerNode->deref(AudioNode::RefTypeConnection);
-        m_pannerNode = 0;
+        m_pannerNode->breakConnection();
+        m_pannerNode.clear();
     }
 }