switch maskfilters to sk_sp

gm/rects.cpp

Index: gm/rects.cpp
diff --git a/gm/rects.cpp b/gm/rects.cpp
index 51eeff0bfb4bf847f901a85ece4aa337d249eeac..9ec7881f90916b0a1150aae7513d6a6c891ee92c 100644
--- a/gm/rects.cpp
+++ b/gm/rects.cpp
@@ -64,11 +64,10 @@ protected:
             SkPaint p;
             p.setColor(SK_ColorWHITE);
             p.setAntiAlias(true);
-            SkMaskFilter* mf = SkBlurMaskFilter::Create(
+            p.setMaskFilter(SkBlurMaskFilter::Make(
                                    kNormal_SkBlurStyle,
                                    SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5)),
-                                   SkBlurMaskFilter::kHighQuality_BlurFlag);
-            p.setMaskFilter(mf)->unref();
+                                   SkBlurMaskFilter::kHighQuality_BlurFlag));
             fPaints.push_back(p);
         }