Fix virtual/override/final usage in the rest of Source/core/.

Source/core/workers/WorkerEventQueue.h

 /*
  * Copyright (C) 2010 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:
  * 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 25 matching lines @@
 namespace blink {
 
 class Event;
 class ExecutionContext;
 
 class WorkerEventQueue final : public EventQueue {
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(WorkerEventQueue);
 public:
 
     static PassOwnPtrWillBeRawPtr<WorkerEventQueue> create(ExecutionContext*);
-    virtual ~WorkerEventQueue();
+    ~WorkerEventQueue() override;
     DECLARE_TRACE();
 
     // EventQueue
-    virtual bool enqueueEvent(PassRefPtrWillBeRawPtr<Event>) override;
-    virtual bool cancelEvent(Event*) override;
-    virtual void close() override;
+    bool enqueueEvent(PassRefPtrWillBeRawPtr<Event>) override;
+    bool cancelEvent(Event*) override;
+    void close() override;
 
 private:
     explicit WorkerEventQueue(ExecutionContext*);
     void removeEvent(Event*);
 
     RawPtrWillBeMember<ExecutionContext> m_executionContext;
     bool m_isClosed;
 
     class EventDispatcherTask;
     using EventTaskMap = WillBeHeapHashMap<RefPtrWillBeMember<Event>, EventDispatcherTask*>;
     EventTaskMap m_eventTaskMap;
 };
 
 }
 
 #endif // WorkerEventQueue_h