Oilpan: Prpare to move WorkerEventQueue to Oilpan heap.

Source/core/workers/WorkerEventQueue.h

Index: Source/core/workers/WorkerEventQueue.h
diff --git a/Source/core/workers/WorkerEventQueue.h b/Source/core/workers/WorkerEventQueue.h
index a738f95ec976d2b3d0c7a93205ff238cadb3671b..9fe0ad57cd6e8541811a37156ee4ea86a95a1364 100644
--- a/Source/core/workers/WorkerEventQueue.h
+++ b/Source/core/workers/WorkerEventQueue.h
@@ -39,12 +39,13 @@ class Event;
 class Node;
 class ExecutionContext;
 
-class WorkerEventQueue FINAL : public EventQueue {
-    WTF_MAKE_FAST_ALLOCATED;
+class WorkerEventQueue FINAL : public NoBaseWillBeGarbageCollectedFinalized<WorkerEventQueue>, public EventQueue {
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
 
-    static PassOwnPtr<WorkerEventQueue> create(ExecutionContext*);
+    static PassOwnPtrWillBeRawPtr<WorkerEventQueue> create(ExecutionContext*);
     virtual ~WorkerEventQueue();
+    void trace(Visitor*);
 
     // EventQueue
     virtual bool enqueueEvent(PassRefPtrWillBeRawPtr<Event>) OVERRIDE;
@@ -59,7 +60,7 @@ private:
     bool m_isClosed;
 
     class EventDispatcherTask;
-    typedef WillBePersistentHeapHashMap<RefPtrWillBeMember<Event>, EventDispatcherTask*> EventTaskMap;
+    typedef WillBeHeapHashMap<RefPtrWillBeMember<Event>, EventDispatcherTask*> EventTaskMap;
     EventTaskMap m_eventTaskMap;
 };