Fix virtual/override/final usage in Source/modules/.

Source/modules/serviceworkers/ExtendableEvent.h

 /*
  * Copyright (C) 2014 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 29 matching lines @@
 
 class WaitUntilObserver;
 
 class MODULES_EXPORT ExtendableEvent : public Event {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<ExtendableEvent> create();
     static PassRefPtrWillBeRawPtr<ExtendableEvent> create(const AtomicString& type, const ExtendableEventInit&);
     static PassRefPtrWillBeRawPtr<ExtendableEvent> create(const AtomicString& type, const ExtendableEventInit&, WaitUntilObserver*);
 
-    virtual ~ExtendableEvent();
+    ~ExtendableEvent() override;
 
     void waitUntil(ScriptState*, const ScriptValue&, ExceptionState&);
 
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     ExtendableEvent();
     ExtendableEvent(const AtomicString& type, const ExtendableEventInit&);
     ExtendableEvent(const AtomicString& type, const ExtendableEventInit&, WaitUntilObserver*);
 
     PersistentWillBeMember<WaitUntilObserver> m_observer;
 };
 
 } // namespace blink
 
 #endif // ExtendableEvent_h