Remove kernelUnitLength plumbing

Source/platform/graphics/filters/FELighting.h

 /*
  * Copyright (C) 2010 University of Szeged
  * Copyright (C) 2010 Zoltan Herczeg
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 32 matching lines @@
 
 protected:
     enum LightingType {
         DiffuseLighting,
         SpecularLighting
     };
 
     FloatRect mapPaintRect(const FloatRect&, bool forward = true) final;
     bool affectsTransparentPixels() override { return true; }
 
-    FELighting(Filter*, LightingType, const Color&, float, float, float, float, float, float, PassRefPtr<LightSource>);
+    FELighting(Filter*, LightingType, const Color&, float, float, float, float, PassRefPtr<LightSource>);
 
     LightingType m_lightingType;
     RefPtr<LightSource> m_lightSource;
 
     Color m_lightingColor;
     float m_surfaceScale;
     float m_diffuseConstant;
     float m_specularConstant;
     float m_specularExponent;
-    float m_kernelUnitLengthX;
-    float m_kernelUnitLengthY;
 };
 
 } // namespace blink
 
 #endif // FELighting_h