Ensure proper finalization of garbage-collected types.

Source/modules/performance/WorkerGlobalScopePerformance.cpp

 /*
  * 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 23 matching lines @@
 
 #include "core/workers/WorkerGlobalScope.h"
 #include "modules/performance/WorkerPerformance.h"
 
 namespace WebCore {
 
 WorkerGlobalScopePerformance::WorkerGlobalScopePerformance()
 {
 }
 
-WorkerGlobalScopePerformance::~WorkerGlobalScopePerformance()
-{
-}
-
 const char* WorkerGlobalScopePerformance::supplementName()
 {
     return "WorkerGlobalScopePerformance";
 }
 
 WorkerGlobalScopePerformance& WorkerGlobalScopePerformance::from(WorkerGlobalScope& context)
 {
     WorkerGlobalScopePerformance* supplement = static_cast<WorkerGlobalScopePerformance*>(WillBeHeapSupplement<WorkerGlobalScope>::from(context, supplementName()));
     if (!supplement) {
         supplement = new WorkerGlobalScopePerformance();
@@ skipping 13 matching lines @@
         m_performance = WorkerPerformance::create();
     return m_performance.get();
 }
 
 void WorkerGlobalScopePerformance::trace(Visitor* visitor)
 {
     visitor->trace(m_performance);
 }
 
 } // namespace WebCore