Web Audio: Unapply Oilpan to AudioSummingJunction.

Source/modules/webaudio/AudioNodeInput.h

Index: Source/modules/webaudio/AudioNodeInput.h
diff --git a/Source/modules/webaudio/AudioNodeInput.h b/Source/modules/webaudio/AudioNodeInput.h
index 54e3a0687196eb805121d8ff139118af5f372142..2dc681de8b0b42c67f9b9ae0cde97ccf3e491e0f 100644
--- a/Source/modules/webaudio/AudioNodeInput.h
+++ b/Source/modules/webaudio/AudioNodeInput.h
@@ -39,12 +39,12 @@ class AudioNodeOutput;
 // In the case of multiple connections, the input will act as a unity-gain summing junction, mixing all the outputs.
 // The number of channels of the input's bus is the maximum of the number of channels of all its connections.
 
-class AudioNodeInput final : public AudioSummingJunction {
+class AudioNodeInput final : public GarbageCollectedFinalized<AudioNodeInput>, public AudioSummingJunction {
 public:
     static AudioNodeInput* create(AudioNode&);
+    DECLARE_TRACE();
 
     // AudioSummingJunction
-    DECLARE_VIRTUAL_TRACE();
     virtual void didUpdate() override;
 
     // Can be called from any thread.