more shader-->sp conversions

gm/roundrects.cpp

Index: gm/roundrects.cpp
diff --git a/gm/roundrects.cpp b/gm/roundrects.cpp
index b616e4d1cff22fd1782d6d3f3a38f58233a7c597..d0401f059568b90c582cb79fe8655f0c1711135a 100644
--- a/gm/roundrects.cpp
+++ b/gm/roundrects.cpp
@@ -261,12 +261,8 @@ protected:
         SkPoint center = SkPoint::Make(SkIntToScalar(0), SkIntToScalar(0));
         SkColor colors[] = { SK_ColorBLUE, SK_ColorRED, SK_ColorGREEN };
         SkScalar pos[] = { 0, SK_ScalarHalf, SK_Scalar1 };
-        SkAutoTUnref<SkShader> shader(SkGradientShader::CreateRadial(center,
-                                                     SkIntToScalar(20),
-                                                     colors,
-                                                     pos,
-                                                     SK_ARRAY_COUNT(colors),
-                                                     SkShader::kClamp_TileMode));
+        auto shader = SkGradientShader::MakeRadial(center, 20, colors, pos, SK_ARRAY_COUNT(colors),
+                                                   SkShader::kClamp_TileMode);
 
         for (int i = 0; i < fPaints.count(); ++i) {
             canvas->save();