Enable Oilpan by default for webaudio/

Source/modules/webaudio/PannerNode.h

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 35 matching lines @@
 
 class PannerNode FINAL : public AudioNode {
 public:
     // These enums are used to distinguish what cached values of panner are dirty.
     enum {
         AzimuthElevationDirty = 0x1,
         DistanceConeGainDirty = 0x2,
         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();
 
     // AudioNode
     virtual void dispose() OVERRIDE;
     virtual void process(size_t framesToProcess) OVERRIDE;
     virtual void pullInputs(size_t framesToProcess) OVERRIDE;
     virtual void initialize() OVERRIDE;
     virtual void uninitialize() OVERRIDE;
@@ skipping 89 matching lines @@
     // AudioContext's connection count
     unsigned m_connectionCount;
 
     // Synchronize process() with setting of the panning model, source's location information, listener, distance parameters and sound cones.
     mutable Mutex m_processLock;
 };
 
 } // namespace blink
 
 #endif // PannerNode_h