Enable Oilpan by default for webaudio/

Source/modules/webaudio/PannerNode.h

Index: Source/modules/webaudio/PannerNode.h
diff --git a/Source/modules/webaudio/PannerNode.h b/Source/modules/webaudio/PannerNode.h
index 2b5dedf8a50818e5b74b2bed29ba9a1affa3e846..de26fe6b4be812c6bc3d7027c09f12ea21e48c41 100644
--- a/Source/modules/webaudio/PannerNode.h
+++ b/Source/modules/webaudio/PannerNode.h
@@ -53,9 +53,9 @@ public:
         DopplerRateDirty = 0x4,
     };
 
-    static PassRefPtrWillBeRawPtr<PannerNode> create(AudioContext* context, float sampleRate)
+    static PannerNode* create(AudioContext* context, float sampleRate)
     {
-        return adoptRefWillBeNoop(new PannerNode(context, sampleRate));
+        return adoptRefCountedGarbageCollectedWillBeNoop(new PannerNode(context, sampleRate));
     }
 
     virtual ~PannerNode();