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/core/SkPath.cpp b/src/core/SkPath.cpp
index a460990..a053c76 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -11,6 +11,7 @@
 #include "SkData.h"
 #include "SkGeometry.h"
 #include "SkMath.h"
+#include "SkMatrixPriv.h"
 #include "SkPathPriv.h"
 #include "SkPathRef.h"
 #include "SkRRect.h"
@@ -1526,7 +1527,7 @@
     SkPoint pts[4];
     Verb    verb;
 
-    SkMatrix::MapPtsProc proc = matrix.getMapPtsProc();
+    SkMatrixPriv::MapPtsProc proc = SkMatrixPriv::GetMapPtsProc(matrix);
     bool firstVerb = true;
     while ((verb = iter.next(pts)) != kDone_Verb) {
         switch (verb) {