Oilpan: Enable oilpan in modules/performance by default

Source/modules/performance/WorkerPerformance.h

Index: Source/modules/performance/WorkerPerformance.h
diff --git a/Source/modules/performance/WorkerPerformance.h b/Source/modules/performance/WorkerPerformance.h
index afdcc372f938708c5ddaf4d25554c73befaa060e..72cc873386d00c37123284b1c1af7a69e44281c1 100644
--- a/Source/modules/performance/WorkerPerformance.h
+++ b/Source/modules/performance/WorkerPerformance.h
@@ -42,9 +42,12 @@ namespace WebCore {
 
 class ExecutionContext;
 
-class WorkerPerformance : public RefCountedWillBeGarbageCollectedFinalized<WorkerPerformance>, public ScriptWrappable {
+class WorkerPerformance : public GarbageCollectedFinalized<WorkerPerformance>, public ScriptWrappable {
 public:
-    static PassRefPtrWillBeRawPtr<WorkerPerformance> create() { return adoptRefWillBeNoop(new WorkerPerformance()); }
+    static WorkerPerformance* create()
+    {
+        return new WorkerPerformance();
+    }
     ~WorkerPerformance();
 
     double now(ExecutionContext*) const;