Web Audio: Unapply Oilpan to AudioSummingJunction.

Source/modules/webaudio/AudioContext.h

Index: Source/modules/webaudio/AudioContext.h
diff --git a/Source/modules/webaudio/AudioContext.h b/Source/modules/webaudio/AudioContext.h
index b8234f5a9112d9250e925c1317a2b03f349cc671..e4cf16a142fac5cc6d46e08485041d04ca64c338 100644
--- a/Source/modules/webaudio/AudioContext.h
+++ b/Source/modules/webaudio/AudioContext.h
@@ -296,7 +296,6 @@ public:
     // Called periodically at the end of each render quantum to dereference finished source nodes.
     void derefFinishedSourceNodes();
 
-    void registerLiveAudioSummingJunction(AudioSummingJunction&);
     void registerLiveNode(AudioNode&);
 
     // Keeps track of the number of connections made.
@@ -428,20 +427,6 @@ private:
     };
     HeapHashMap<WeakMember<AudioNode>, OwnPtr<AudioNodeDisposer>> m_liveNodes;
 
-    class AudioSummingJunctionDisposer {
-    public:
-        explicit AudioSummingJunctionDisposer(AudioSummingJunction& junction) : m_junction(junction) { }
-        ~AudioSummingJunctionDisposer();
-
-    private:
-        AudioSummingJunction& m_junction;
-    };
-    // The purpose of m_liveAudioSummingJunctions is to remove a dying
-    // AudioSummingJunction from m_dirtySummingJunctions. However we put all of
-    // AudioSummingJunction objects to m_liveAudioSummingJunctions to avoid
-    // concurrent access to m_liveAudioSummingJunctions.
-    HeapHashMap<WeakMember<AudioSummingJunction>, OwnPtr<AudioSummingJunctionDisposer>> m_liveAudioSummingJunctions;
-
     unsigned m_connectionCount;
 
     // Graph locking.