Simplify WorkerGlobalScope::m_eventListeners.

third_party/WebKit/Source/core/workers/WorkerGlobalScope.h

 /*
  * Copyright (C) 2008, 2009 Apple 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 190 matching lines @@
   bool m_closing;
 
   Member<WorkerEventQueue> m_eventQueue;
 
   CrossThreadPersistent<WorkerClients> m_workerClients;
 
   DOMTimerCoordinator m_timers;
 
   const double m_timeOrigin;
 
-  HeapListHashSet<Member<V8AbstractEventListener>> m_eventListeners;
+  HeapHashSet<Member<V8AbstractEventListener>> m_eventListeners;
 
   HeapHashMap<int, Member<ErrorEvent>> m_pendingErrorEvents;
   int m_lastPendingErrorEventId;
 };
 
 DEFINE_TYPE_CASTS(WorkerGlobalScope,
                   ExecutionContext,
                   context,
                   context->isWorkerGlobalScope(),
                   context.isWorkerGlobalScope());
 
 }  // namespace blink
 
 #endif  // WorkerGlobalScope_h