Ensure proper finalization of garbage-collected types.

Source/modules/performance/WorkerGlobalScopePerformance.h

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 24 matching lines @@
 #include "modules/performance/WorkerPerformance.h"
 #include "platform/Supplementable.h"
 
 namespace WebCore {
 
 class WorkerGlobalScope;
 
 class WorkerGlobalScopePerformance FINAL : public NoBaseWillBeGarbageCollected<WorkerGlobalScopePerformance>, public WillBeHeapSupplement<WorkerGlobalScope> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(WorkerGlobalScopePerformance);
 public:
-    virtual ~WorkerGlobalScopePerformance();
     static WorkerGlobalScopePerformance& from(WorkerGlobalScope&);
 
     static WorkerPerformance* performance(WorkerGlobalScope&);
 
     virtual void trace(Visitor*);
 
 private:
     WorkerGlobalScopePerformance();
 
     WorkerPerformance* performance();
     static const char* supplementName();
 
     RefPtrWillBeMember<WorkerPerformance> m_performance;
 };
 
 } // namespace WebCore
 
 #endif // WorkerGlobalScopePerformance_h