Update more platform classes to use OVERRIDE / FINAL when needed

Source/platform/graphics/filters/FEColorMatrix.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 31 matching lines @@
     static PassRefPtr<FEColorMatrix> create(Filter*, ColorMatrixType, const Vector<float>&);
 
     ColorMatrixType type() const;
     bool setType(ColorMatrixType);
 
     const Vector<float>& values() const;
     bool setValues(const Vector<float>&);
 
     virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
 
-    virtual TextStream& externalRepresentation(TextStream&, int indention) const;
+    virtual TextStream& externalRepresentation(TextStream&, int indention) const OVERRIDE;
 
     static inline void calculateSaturateComponents(float* components, float value);
     static inline void calculateHueRotateComponents(float* components, float value);
 
 private:
     FEColorMatrix(Filter*, ColorMatrixType, const Vector<float>&);
 
     virtual void applySoftware() OVERRIDE;
     virtual bool applySkia() OVERRIDE;
 
@@ skipping 28 matching lines @@
     components[5] = 0.072 - cosHue * 0.072 - sinHue * 0.283;
     components[6] = 0.213 - cosHue * 0.213 - sinHue * 0.787;
     components[7] = 0.715 - cosHue * 0.715 + sinHue * 0.715;
     components[8] = 0.072 + cosHue * 0.928 + sinHue * 0.072;
 }
 
 
 } // namespace WebCore
 
 #endif // FEColorMatrix_h