Oilpan: move WorkerGlobalScope to oilpan's heap.

Source/modules/performance/WorkerGlobalScopePerformance.h

Index: Source/modules/performance/WorkerGlobalScopePerformance.h
diff --git a/Source/modules/performance/WorkerGlobalScopePerformance.h b/Source/modules/performance/WorkerGlobalScopePerformance.h
index ee125329f763c0c9aa4a6da1cc902416d720c46f..6cd76c9ec7a71368283f604e53606c5ec87cb55f 100644
--- a/Source/modules/performance/WorkerGlobalScopePerformance.h
+++ b/Source/modules/performance/WorkerGlobalScopePerformance.h
@@ -37,20 +37,22 @@
 
 namespace WebCore {
 
-class WorkerGlobalScopePerformance FINAL : public WorkerSupplement {
+class WorkerGlobalScopePerformance FINAL : public NoBaseWillBeGarbageCollected<WorkerGlobalScopePerformance>, public WorkerSupplement {
 public:
     virtual ~WorkerGlobalScopePerformance();
     static WorkerGlobalScopePerformance& from(WorkerGlobalScope&);
 
     static WorkerPerformance* performance(WorkerGlobalScope&);
 
+    virtual void trace(Visitor*);
+
 private:
     WorkerGlobalScopePerformance();
 
     WorkerPerformance* performance();
     static const char* supplementName();
 
-    RefPtrWillBePersistent<WorkerPerformance> m_performance;
+    RefPtrWillBeMember<WorkerPerformance> m_performance;
 };
 
 } // namespace WebCore