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

Source/core/frame/LocalDOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 109 matching lines @@
         , m_userGestureToken(userGestureToken)
         , m_preventDestruction(false)
     {
         m_asyncOperationId = InspectorInstrumentation::traceAsyncOperationStarting(executionContext(), "postMessage");
     }
 
     PassRefPtrWillBeRawPtr<MessageEvent> event() const { return m_event.get(); }
     SecurityOrigin* targetOrigin() const { return m_targetOrigin.get(); }
     ScriptCallStack* stackTrace() const { return m_stackTrace.get(); }
     UserGestureToken* userGestureToken() const { return m_userGestureToken.get(); }
-    virtual void stop() override
+    void stop() override
     {
         SuspendableTimer::stop();
 
         if (!m_preventDestruction) {
             // Will destroy this object
             m_window->removePostMessageTimer(this);
         }
     }
 
     // Eager finalization is needed to promptly stop this timer object.
     // (see DOMTimer comment for more.)
     EAGERLY_FINALIZE();
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         visitor->trace(m_event);
         visitor->trace(m_window);
         visitor->trace(m_stackTrace);
         SuspendableTimer::trace(visitor);
     }
 
 private:
-    virtual void fired() override
+    void fired() override
     {
         InspectorInstrumentationCookie cookie = InspectorInstrumentation::traceAsyncOperationCompletedCallbackStarting(executionContext(), m_asyncOperationId);
         // Prevent calls to stop triggered from the event handler to
         // kill this object.
         m_preventDestruction = true;
         m_window->postMessageTimerFired(this);
         // Will destroy this object
         m_window->removePostMessageTimer(this);
         InspectorInstrumentation::traceAsyncCallbackCompleted(cookie);
     }
@@ skipping 1323 matching lines @@
     DOMWindow::trace(visitor);
     DOMWindowLifecycleNotifier::trace(visitor);
 }
 
 LocalFrame* LocalDOMWindow::frame() const
 {
     return m_frameObserver->frame();
 }
 
 } // namespace blink