WebAudio: Remove AudioNode::RefType.

Source/modules/webaudio/AudioNode.h

Index: Source/modules/webaudio/AudioNode.h
diff --git a/Source/modules/webaudio/AudioNode.h b/Source/modules/webaudio/AudioNode.h
index cfbb2d1fe3a54b5c70114106f77f5f2f27284e26..d49f8faa45d4e3f15a7f429e300b847c61bfa70f 100644
--- a/Source/modules/webaudio/AudioNode.h
+++ b/Source/modules/webaudio/AudioNode.h
@@ -93,17 +93,21 @@ public:
     String nodeTypeName() const;
     void setNodeType(NodeType);
 
-    // We handle our own ref-counting because of the threading issues and subtle nature of
-    // how AudioNodes can continue processing (playing one-shot sound) after there are no more
-    // JavaScript references to the object.
-    enum RefType { RefTypeNormal, RefTypeConnection };
-
     // Can be called from main thread or context's audio thread.
-    void ref(RefType refType = RefTypeNormal);
-    void deref(RefType refType = RefTypeNormal);
+    void ref();
+    void deref();
+
+    // This object has been connected to another object. This might have
+    // existing connections from others.
+    // This function must be called after acquiring a connection reference.
+    void makeConnection();
+    // This object will be disconnected from another object. This might have
+    // remaining connections from others.
+    // This function must be called before releasing a connection reference.
+    void breakConnection();
 
     // Can be called from main thread or context's audio thread.  It must be called while the context's graph lock is held.
-    void finishDeref(RefType refType);
+    void finishDeref();
 
     // The AudioNodeInput(s) (if any) will already have their input data available when process() is called.
     // Subclasses will take this input data and put the results in the AudioBus(s) of its AudioNodeOutput(s) (if any).
@@ -225,6 +229,7 @@ private:
     // Ref-counting
     volatile int m_normalRefCount;
     volatile int m_connectionRefCount;
+    bool m_wasDisconnected;
 
     bool m_isMarkedForDeletion;
     bool m_isDisabled;