Update platform classes to use OVERRIDE / FINAL when needed

Source/platform/fonts/SimpleFontData.h

 /*
  * This file is part of the internal font implementation.
  *
  * Copyright (C) 2006, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007-2008 Torch Mobile, Inc.
  *
  * 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.
@@ skipping 135 matching lines @@
     bool isSVGFont() const { return m_customFontData && m_customFontData->isSVGFont(); }
     virtual bool isCustomFont() const OVERRIDE { return m_customFontData; }
     virtual bool isLoading() const OVERRIDE { return m_customFontData ? m_customFontData->isLoading() : false; }
     virtual bool isLoadingFallback() const OVERRIDE { return m_customFontData ? m_customFontData->isLoadingFallback() : false; }
     virtual bool isSegmented() const OVERRIDE;
 
     const GlyphData& missingGlyphData() const { return m_missingGlyphData; }
     void setMissingGlyphData(const GlyphData& glyphData) { m_missingGlyphData = glyphData; }
 
 #ifndef NDEBUG
-    virtual String description() const;
+    virtual String description() const OVERRIDE;
 #endif
 
 #if OS(MACOSX)
     const SimpleFontData* getCompositeFontReferenceFontData(NSFont *key) const;
     NSFont* getNSFont() const { return m_platformData.font(); }
 #endif
 
 #if OS(MACOSX)
     CFDictionaryRef getCFStringAttributes(TypesettingFeatures, FontOrientation) const;
 #endif
@@ skipping 127 matching lines @@
 #endif
     else
         width = platformWidthForGlyph(glyph);
 
     m_glyphToWidthMap.setMetricsForGlyph(glyph, width);
     return width;
 }
 
 } // namespace WebCore
 #endif // SimpleFontData_h