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

src/effects/gradients/Sk4fGradientBase.h

Index: src/effects/gradients/Sk4fGradientBase.h
diff --git a/src/effects/gradients/Sk4fGradientBase.h b/src/effects/gradients/Sk4fGradientBase.h
index 1e65308f69402d67be3304f1de28c37c1aa5e950..1fece72b520fd327c3607bb24218cd4b3178aaec 100644
--- a/src/effects/gradients/Sk4fGradientBase.h
+++ b/src/effects/gradients/Sk4fGradientBase.h
@@ -29,8 +29,6 @@ protected:
         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; }