Update SkBlurImageFilter to sk_sp

TBR=reed@google.com

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1852743002

Review URL: https://codereview.chromium.org/1852743002
diff --git a/samplecode/SampleFilterFuzz.cpp b/samplecode/SampleFilterFuzz.cpp
index dd17e7e..6413aa1 100644
--- a/samplecode/SampleFilterFuzz.cpp
+++ b/samplecode/SampleFilterFuzz.cpp
@@ -583,13 +583,11 @@
                     : nullptr;
         break;
     }
-    case BLUR: {
-        sk_sp<SkImageFilter> subFilter(make_image_filter());
-        filter = sk_sp<SkImageFilter>(SkBlurImageFilter::Create(make_scalar(true),
-                                                                make_scalar(true),
-                                                                subFilter.get()));
+    case BLUR:
+        filter = SkBlurImageFilter::Make(make_scalar(true),
+                                         make_scalar(true),
+                                         make_image_filter());
         break;
-    }
     case MAGNIFIER:
         filter = sk_sp<SkImageFilter>(SkMagnifierImageFilter::Create(make_rect(), 
                                                                      make_scalar(true)));