Revert "Revert "move onto new factories for SkMatrix""

This reverts commit c80ee456adf664c4a62fa2ccaeaf157c723ed656.

fix: update flutter's gn file to add guard

Change-Id: Iac5171c8475d9a862d06255dab1c6f38f10de2f2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/291361
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/docs/examples/Matrix_MakeScale.cpp b/docs/examples/Matrix_MakeScale.cpp
index 0699ce3..166b8de 100644
--- a/docs/examples/Matrix_MakeScale.cpp
+++ b/docs/examples/Matrix_MakeScale.cpp
@@ -4,7 +4,7 @@
 // HASH=7ff17718111df6d6f95381d8a8f1b389
 REG_FIDDLE(Matrix_MakeScale, 256, 256, false, 4) {
 void draw(SkCanvas* canvas) {
-    canvas->concat(SkMatrix::MakeScale(4, 3));
+    canvas->concat(SkMatrix::Scale(4, 3));
     canvas->drawBitmap(source, 0, 0);
 }
 }  // END FIDDLE