Revert "move SkMatrix anonymous affine enum to private"

This reverts commit 708ec81d7a9bba12cd7e574b5c5ae80b2ad77919.

Reason for revert: broke android

frameworks/base/core/jni/android/graphics/pdf/PdfEditor.cpp
frameworks/base/core/jni/android/graphics/pdf/PdfEditor.cpp:153:54: error: no member named 'kAScaleX' in 'SkMatrix'; did you mean 'kMScaleX'?
    FS_MATRIX transform = {transformValues[SkMatrix::kAScaleX], transformValues[SkMatrix::kASkewY],
                                           ~~~~~~~~~~^~~~~~~~


Original change's description:
> move SkMatrix anonymous affine enum to private
> 
> enum members aren't used by SkMatrix.h or by
> clients outside of Skia.
> 
> R: reed@google.com, bungeman@google.com
> Bug: skia:6898
> Change-Id: I6873b4106e5ffe354caf5ec18cc613910304fa13
> Reviewed-on: https://skia-review.googlesource.com/59160
> Reviewed-by: Mike Reed <reed@google.com>
> Reviewed-by: Ben Wagner <bungeman@google.com>
> Commit-Queue: Cary Clark <caryclark@skia.org>

TBR=bungeman@google.com,reed@google.com,caryclark@skia.org

Change-Id: I7fe80879e8b851c9036fc910a314129c299d82d2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:6898
Reviewed-on: https://skia-review.googlesource.com/59460
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/tests/MatrixTest.cpp b/tests/MatrixTest.cpp
index 3e20f0b..6f7a14f 100644
--- a/tests/MatrixTest.cpp
+++ b/tests/MatrixTest.cpp
@@ -6,7 +6,7 @@
  */
 
 #include "SkMath.h"
-#include "SkMatrixPriv.h"
+#include "SkMatrix.h"
 #include "SkMatrixUtils.h"
 #include "SkRandom.h"
 #include "Test.h"
@@ -912,7 +912,7 @@
     SkScalar affine[6];
     REPORTER_ASSERT(reporter, mat.asAffine(affine));
 
-    #define affineEqual(e) affine[SkMatrixPriv::kA##e] == mat.get(SkMatrix::kM##e)
+    #define affineEqual(e) affine[SkMatrix::kA##e] == mat.get(SkMatrix::kM##e)
     REPORTER_ASSERT(reporter, affineEqual(ScaleX));
     REPORTER_ASSERT(reporter, affineEqual(SkewY));
     REPORTER_ASSERT(reporter, affineEqual(SkewX));