Drop some dead code from FilterEffect

Source/platform/graphics/filters/FEComposite.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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef FEComposite_h
 #define FEComposite_h
 
 #include "SkXfermode.h"
 #include "platform/graphics/filters/FilterEffect.h"
-#include "wtf/text/WTFString.h"
 
 namespace blink {
 
 enum CompositeOperationType {
     FECOMPOSITE_OPERATOR_UNKNOWN    = 0,
     FECOMPOSITE_OPERATOR_OVER       = 1,
     FECOMPOSITE_OPERATOR_IN         = 2,
     FECOMPOSITE_OPERATOR_OUT        = 3,
     FECOMPOSITE_OPERATOR_ATOP       = 4,
     FECOMPOSITE_OPERATOR_XOR        = 5,
@@ skipping 28 matching lines @@
     virtual PassRefPtr<SkImageFilter> createImageFilterWithoutValidation(SkiaImageFilterBuilder*) override;
 
 protected:
     virtual bool mayProduceInvalidPreMultipliedPixels() override { return m_type == FECOMPOSITE_OPERATOR_ARITHMETIC; }
 
 private:
     FEComposite(Filter*, const CompositeOperationType&, float, float, float, float);
 
     PassRefPtr<SkImageFilter> createImageFilterInternal(SkiaImageFilterBuilder*, bool requiresPMColorValidation);
 
-    template <int b1, int b4>
-    static inline void computeArithmeticPixelsNeon(unsigned char* source, unsigned  char* destination,
-        unsigned pixelArrayLength, float k1, float k2, float k3, float k4);
-    static inline void platformArithmeticNeon(unsigned char* source, unsigned  char* destination,
-        unsigned pixelArrayLength, float k1, float k2, float k3, float k4);
-
     CompositeOperationType m_type;
     float m_k1;
     float m_k2;
     float m_k3;
     float m_k4;
 };
 
 } // namespace blink
 
 #endif // FEComposite_h