Fix 4f gradient swizzle post http://crrev.com/1774523002

src/effects/gradients/Sk4fGradientBase.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef Sk4fGradientBase_DEFINED
 #define Sk4fGradientBase_DEFINED
 
@@ skipping 11 matching lines @@
     GradientShaderBase4fContext(const SkGradientShaderBase&,
                                 const ContextRec&);
 
     uint32_t getFlags() const override { return fFlags; }
 
 protected:
     struct Interval {
         Interval(SkPMColor c0, SkScalar p0,
                  SkPMColor c1, SkScalar p1,
                  const Sk4f& componentScale);
-        Interval(const Sk4f& c0, const Sk4f& dc,
-                 SkScalar p0, SkScalar p1);
 
         bool isZeroRamp() const { return fZeroRamp; }
 
         // true when fx is in [p0,p1)
         bool contains(SkScalar fx) const;
 
         SkPM4f   fC0, fDc;
         SkScalar fP0, fP1;
         bool     fZeroRamp;
     };
 
     SkSTArray<8, Interval, true> fIntervals;
     SkMatrix                     fDstToPos;
     SkMatrix::MapXYProc          fDstToPosProc;
     uint8_t                      fDstToPosClass;
     uint8_t                      fFlags;
     bool                         fDither;
     bool                         fColorsArePremul;
 
 private:
     using INHERITED = SkShader::Context;
 };
 
 #endif // Sk4fGradientBase_DEFINED