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

Source/modules/serviceworkers/ServiceWorker.h

 /*
  * 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 50 matching lines @@
     DECLARE_EAGER_FINALIZATION_OPERATOR_NEW();
 #endif
 
     void postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionState&);
 
     String scriptURL() const;
     String state() const;
     DEFINE_ATTRIBUTE_EVENT_LISTENER(statechange);
 
     // WebServiceWorkerProxy overrides.
-    virtual void dispatchStateChangeEvent() override;
+    void dispatchStateChangeEvent() override;
 
     // AbstractWorker overrides.
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
 
     void internalsTerminate();
 private:
     static PassRefPtrWillBeRawPtr<ServiceWorker> getOrCreate(ExecutionContext*, WebType*);
     ServiceWorker(ExecutionContext*, PassOwnPtr<WebServiceWorker>);
 
     // ActiveDOMObject overrides.
-    virtual bool hasPendingActivity() const override;
-    virtual void stop() override;
+    bool hasPendingActivity() const override;
+    void stop() override;
 
     OwnPtr<WebServiceWorker> m_outerWorker;
     bool m_wasStopped;
 };
 
 } // namespace blink
 
 #endif // ServiceWorker_h