Update DropShadowImageFilter to sk_sp

TBR=reed@google.com

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1861843002

Review URL: https://codereview.chromium.org/1861843002
diff --git a/gm/imagefiltersbase.cpp b/gm/imagefiltersbase.cpp
index ebbd895..f35357f 100644
--- a/gm/imagefiltersbase.cpp
+++ b/gm/imagefiltersbase.cpp
@@ -202,9 +202,10 @@
             FailImageFilter::Make(),
             SkColorFilterImageFilter::Make(std::move(cf), nullptr),
             SkBlurImageFilter::Make(12.0f, 0.0f, nullptr),
-            sk_sp<SkImageFilter>(SkDropShadowImageFilter::Create(
+            SkDropShadowImageFilter::Make(
                                     10.0f, 5.0f, 3.0f, 3.0f, SK_ColorBLUE,
-                                    SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode)),
+                                    SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
+                                    nullptr),
         };
 
         SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));