change flattenable factory to return sk_sp

src/effects/SkLumaColorFilter.cpp

Index: src/effects/SkLumaColorFilter.cpp
diff --git a/src/effects/SkLumaColorFilter.cpp b/src/effects/SkLumaColorFilter.cpp
index 18b2485a30ced845ad912109988cfdbe8458974c..28b2e1eb445b4c3a9c2e2b61fa8ea209133d0219 100644
--- a/src/effects/SkLumaColorFilter.cpp
+++ b/src/effects/SkLumaColorFilter.cpp
@@ -43,7 +43,9 @@ sk_sp<SkColorFilter> SkLumaColorFilter::Make() {
 
 SkLumaColorFilter::SkLumaColorFilter() : INHERITED() {}
 
-SkFlattenable* SkLumaColorFilter::CreateProc(SkReadBuffer&) { return new SkLumaColorFilter; }
+sk_sp<SkFlattenable> SkLumaColorFilter::CreateProc(SkReadBuffer&) {
+    return Make();
+}
 
 void SkLumaColorFilter::flatten(SkWriteBuffer&) const {}