Update DropShadowImageFilter to sk_sp

gm/imagefiltersbase.cpp

Index: gm/imagefiltersbase.cpp
diff --git a/gm/imagefiltersbase.cpp b/gm/imagefiltersbase.cpp
index ebbd8956a553c4cc7a8e8711767741f4ae7722c8..f35357fe3421dd2f769bf9768455b8f05b497a3d 100644
--- a/gm/imagefiltersbase.cpp
+++ b/gm/imagefiltersbase.cpp
@@ -202,9 +202,10 @@ protected:
             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));