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

Source/modules/serviceworkers/ServiceWorkerMessageEvent.h

Index: Source/modules/serviceworkers/ServiceWorkerMessageEvent.h
diff --git a/Source/modules/serviceworkers/ServiceWorkerMessageEvent.h b/Source/modules/serviceworkers/ServiceWorkerMessageEvent.h
index 2891df6377132a73e7a4e2636ed89091c06a2470..832e66b2abd22f091ca59a9b99f4562b8e485e3a 100644
--- a/Source/modules/serviceworkers/ServiceWorkerMessageEvent.h
+++ b/Source/modules/serviceworkers/ServiceWorkerMessageEvent.h
@@ -31,7 +31,7 @@ public:
         return adoptRefWillBeNoop(new ServiceWorkerMessageEvent(data, String(), String(), source, ports));
     }
 
-    virtual ~ServiceWorkerMessageEvent();
+    ~ServiceWorkerMessageEvent() override;
 
     ScriptValue data() const { return m_data; }
     SerializedScriptValue* serializedData() const { return m_serializedData.get(); }
@@ -41,7 +41,7 @@ public:
     MessagePortArray ports() const;
     void source(ServiceWorkerOrMessagePort& result) const;
 
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
 
     DECLARE_VIRTUAL_TRACE();