make skmatrix getmapproc private

Make SkMatrix MapXYProc MapPtsProc and friends private.
Code search turned up no clients in chromium, google3,
android. Fingers crossed.

R:reed@google.com
Bug: skia:6898
Change-Id: Iee20fe5150499215a09f67cc6f117b685f38f455
Reviewed-on: https://skia-review.googlesource.com/62140
Commit-Queue: Cary Clark <caryclark@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
diff --git a/src/shaders/gradients/Sk4fGradientBase.h b/src/shaders/gradients/Sk4fGradientBase.h
index b2c2b37..6361eec 100644
--- a/src/shaders/gradients/Sk4fGradientBase.h
+++ b/src/shaders/gradients/Sk4fGradientBase.h
@@ -11,7 +11,7 @@
 #include "Sk4fGradientPriv.h"
 #include "SkColor.h"
 #include "SkGradientShaderPriv.h"
-#include "SkMatrix.h"
+#include "SkMatrixPriv.h"
 #include "SkNx.h"
 #include "SkPM4f.h"
 #include "SkShaderBase.h"
@@ -65,7 +65,7 @@
 protected:
     Sk4fGradientIntervalBuffer fIntervals;
     SkMatrix                   fDstToPos;
-    SkMatrix::MapXYProc        fDstToPosProc;
+    SkMatrixPriv::MapXYProc    fDstToPosProc;
     uint8_t                    fFlags;
     bool                       fColorsArePremul;
     bool                       fDither;