Simplify common case for recttorect

Change-Id: I70e295a677b8cac3d578e3cd57472c833af03877
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/354336
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/samplecode/SampleXfer.cpp b/samplecode/SampleXfer.cpp
index 40feb3b..68b179e 100644
--- a/samplecode/SampleXfer.cpp
+++ b/samplecode/SampleXfer.cpp
@@ -263,8 +263,7 @@
 
         paint.setColor(SK_ColorRED);
         paint.setStroke(false);
-        SkPoint loc = SkMatrix::MakeRectToRect({0,0,1,1}, fDomain, SkMatrix::kFill_ScaleToFit)
-                      .mapXY(fCubic.B, fCubic.C);
+        SkPoint loc = SkMatrix::RectToRect({0,0,1,1}, fDomain).mapXY(fCubic.B, fCubic.C);
         canvas->drawCircle(loc.fX, loc.fY, 8, paint);
 
         SkString str;