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/samplecode/SampleFuzz.cpp b/samplecode/SampleFuzz.cpp
index b8c800a..76420f0 100644
--- a/samplecode/SampleFuzz.cpp
+++ b/samplecode/SampleFuzz.cpp
@@ -189,8 +189,7 @@
 
     case 7:
       if (quick == true) break;
-          SkSafeUnref(paint.setMaskFilter(SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
-                                                                   make_number())));
+      paint.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle, make_number()));
       break;
 
     case 8: