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

Source/modules/serviceworkers/ServiceWorker.h

Index: Source/modules/serviceworkers/ServiceWorker.h
diff --git a/Source/modules/serviceworkers/ServiceWorker.h b/Source/modules/serviceworkers/ServiceWorker.h
index 615a7260943aff7bf4d15dea750c4872c739adda..f4be4f5a072b994aa411c4717c5728ecc2674263 100644
--- a/Source/modules/serviceworkers/ServiceWorker.h
+++ b/Source/modules/serviceworkers/ServiceWorker.h
@@ -68,10 +68,10 @@ public:
     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:
@@ -79,8 +79,8 @@ private:
     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;