partial switch over to sp usage of shaders

gm/drawminibitmaprect.cpp

Index: gm/drawminibitmaprect.cpp
diff --git a/gm/drawminibitmaprect.cpp b/gm/drawminibitmaprect.cpp
index 85071c56c4a9b91f069e86c99718b53b9414b834..f0ce1a2db6d57cfbf7181c27f0552a4c08b8533a 100644
--- a/gm/drawminibitmaprect.cpp
+++ b/gm/drawminibitmaprect.cpp
@@ -46,12 +46,12 @@ static SkImage* makebm(SkCanvas* caller, int w, int h) {
     SkRect rect = SkRect::MakeWH(wScalar, hScalar);
     SkMatrix mat = SkMatrix::I();
     for (int i = 0; i < 4; ++i) {
-        paint.setShader(SkGradientShader::CreateRadial(
+        paint.setShader(SkGradientShader::MakeRadial(
                         pt, radius,
                         colors, pos,
                         SK_ARRAY_COUNT(colors),
                         SkShader::kRepeat_TileMode,
-                        0, &mat))->unref();
+                        0, &mat));
         canvas->drawRect(rect, paint);
         rect.inset(wScalar / 8, hScalar / 8);
         mat.postScale(SK_Scalar1 / 4, SK_Scalar1 / 4);