Remove software path from filters: purge unused applySkia.

Source/platform/graphics/filters/FilterEffect.h

 /*
  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * 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 181 matching lines @@
 
     // If a pre-multiplied image, check every pixel for validity and correct if necessary.
     void forceValidPreMultipliedPixels();
     SkImageFilter::CropRect getCropRect(const FloatSize& cropOffset) const;
 
     void addAbsolutePaintRect(const FloatRect& absolutePaintRect);
 
 private:
     void applyRecursive();
     virtual void applySoftware() = 0;
-    virtual bool applySkia() { return false; }
 
     inline void copyImageBytes(Uint8ClampedArray* source, Uint8ClampedArray* destination, const IntRect&);
 
     OwnPtr<ImageBuffer> m_imageBufferResult;
     RefPtr<Uint8ClampedArray> m_unmultipliedImageResult;
     RefPtr<Uint8ClampedArray> m_premultipliedImageResult;
     FilterEffectVector m_inputEffects;
 
     bool m_alphaImage;
 
@@ skipping 22 matching lines @@
     // Should the effect clip to its primitive region, or expand to use the combined region of its inputs.
     bool m_clipsToBounds;
 
     ColorSpace m_operatingColorSpace;
     ColorSpace m_resultColorSpace;
 };
 
 } // namespace WebCore
 
 #endif // FilterEffect_h