Update more core classes to use OVERRIDE / FINAL when needed

Source/core/html/HTMLMeterElement.h

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 42 matching lines @@
 
     double high() const;
     void setHigh(double, ExceptionState&);
 
     double optimum() const;
     void setOptimum(double, ExceptionState&);
 
     double valueRatio() const;
     GaugeRegion gaugeRegion() const;
 
-    bool canContainRangeEndPoint() const { return false; }
+    virtual bool canContainRangeEndPoint() const OVERRIDE { return false; }
 
 private:
     explicit HTMLMeterElement(Document&);
     virtual ~HTMLMeterElement();
 
     virtual bool areAuthorShadowsAllowed() const OVERRIDE { return false; }
     RenderMeter* renderMeter() const;
 
     virtual bool supportLabels() const OVERRIDE { return true; }
 
     virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
 
     void didElementStateChange();
     virtual void didAddUserAgentShadowRoot(ShadowRoot&) OVERRIDE;
 
     RefPtr<MeterValueElement> m_value;
 };
 
 DEFINE_NODE_TYPE_CASTS(HTMLMeterElement, hasTagName(HTMLNames::meterTag));
 
 } // namespace
 
 #endif