Revert of Change mapRectScaleTranslate to pass args/ret by value

tests/MatrixTest.cpp

Index: tests/MatrixTest.cpp
diff --git a/tests/MatrixTest.cpp b/tests/MatrixTest.cpp
index 6cba60421669d16807cc97930508ce1a23450607..414aab2f9a85b77e3d4118bb7b97859486f2c053 100644
--- a/tests/MatrixTest.cpp
+++ b/tests/MatrixTest.cpp
@@ -984,7 +984,7 @@
         mat.mapPoints((SkPoint*)&dst[0].fLeft, (SkPoint*)&src.fLeft, 2);
         dst[0].sort();
         mat.mapRect(&dst[1], src);
-        dst[2] = mat.mapRectScaleTranslate(src);
+        mat.mapRectScaleTranslate(&dst[2], src);
 
         REPORTER_ASSERT(r, dst[0] == dst[1]);
         REPORTER_ASSERT(r, dst[0] == dst[2]);