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/SampleFilterFuzz.cpp b/samplecode/SampleFilterFuzz.cpp
index 6413aa1..1b7d30b 100644
--- a/samplecode/SampleFilterFuzz.cpp
+++ b/samplecode/SampleFilterFuzz.cpp
@@ -461,13 +461,12 @@
     return pathEffect;
 }
 
-static SkMaskFilter* make_mask_filter() {
-    SkMaskFilter* maskFilter;
+static sk_sp<SkMaskFilter> make_mask_filter() {
+    sk_sp<SkMaskFilter> maskFilter;
     switch (R(3)) {
         case 0:
-            maskFilter = SkBlurMaskFilter::Create(make_blur_style(),
-                                                  make_scalar(),
-                                                  make_blur_mask_filter_flag());
+            maskFilter = SkBlurMaskFilter::Make(make_blur_style(), make_scalar(),
+                                                make_blur_mask_filter_flag());
         case 1: {
             SkEmbossMaskFilter::Light light;
             for (int i = 0; i < 3; ++i) {
@@ -476,12 +475,10 @@
             light.fPad = R(65536);
             light.fAmbient = R(256);
             light.fSpecular = R(256);
-            maskFilter = SkEmbossMaskFilter::Create(make_scalar(),
-                                                    light);
+            maskFilter = SkEmbossMaskFilter::Make(make_scalar(), light);
         }
         case 2:
         default:
-            maskFilter = nullptr;
             break;
     }
     return maskFilter;