switch maskfilters to sk_sp

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1852113003

Review URL: https://codereview.chromium.org/1852113003
diff --git a/gm/blurredclippedcircle.cpp b/gm/blurredclippedcircle.cpp
index d162ac1..495d16a 100644
--- a/gm/blurredclippedcircle.cpp
+++ b/gm/blurredclippedcircle.cpp
@@ -63,10 +63,10 @@
 
                     SkPaint paint;
 
-                    paint.setMaskFilter(SkBlurMaskFilter::Create(
+                    paint.setMaskFilter(SkBlurMaskFilter::Make(
                                             kNormal_SkBlurStyle,
                                             1.366025f,
-                                            SkBlurMaskFilter::kHighQuality_BlurFlag))->unref();
+                                            SkBlurMaskFilter::kHighQuality_BlurFlag));
                     paint.setColorFilter(SkColorFilter::MakeModeFilter(
                                              SK_ColorRED,
                                              SkXfermode::kSrcIn_Mode));