Update more platform classes to use OVERRIDE / FINAL when needed

Source/platform/graphics/filters/FEMorphology.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * 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 32 matching lines @@
     float radiusX() const;
     bool setRadiusX(float);
 
     float radiusY() const;
     bool setRadiusY(float);
 
     virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
 
     virtual FloatRect mapRect(const FloatRect&, bool forward = true) OVERRIDE FINAL;
 
-    virtual TextStream& externalRepresentation(TextStream&, int indention) const;
+    virtual TextStream& externalRepresentation(TextStream&, int indention) const OVERRIDE;
 
     struct PaintingData {
         Uint8ClampedArray* srcPixelArray;
         Uint8ClampedArray* dstPixelArray;
         int width;
         int height;
         int radiusX;
         int radiusY;
     };
 
@@ skipping 17 matching lines @@
     virtual bool applySkia() OVERRIDE;
 
     MorphologyOperatorType m_type;
     float m_radiusX;
     float m_radiusY;
 };
 
 } // namespace WebCore
 
 #endif // FEMorphology_h