change flattenable factory to return sk_sp

src/effects/SkTableMaskFilter.cpp

Index: src/effects/SkTableMaskFilter.cpp
diff --git a/src/effects/SkTableMaskFilter.cpp b/src/effects/SkTableMaskFilter.cpp
index ddf9f33f54265fef4fdc9a74b6e9e26233998d32..d83465296212fa5ed7c498fb98a3127b35a1653b 100644
--- a/src/effects/SkTableMaskFilter.cpp
+++ b/src/effects/SkTableMaskFilter.cpp
@@ -73,12 +73,12 @@ void SkTableMaskFilter::flatten(SkWriteBuffer& wb) const {
     wb.writeByteArray(fTable, 256);
 }
 
-SkFlattenable* SkTableMaskFilter::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkTableMaskFilter::CreateProc(SkReadBuffer& buffer) {
     uint8_t table[256];
     if (!buffer.readByteArray(table, 256)) {
         return nullptr;
     }
-    return Create(table);
+    return sk_sp<SkFlattenable>(Create(table));
 }
 
 ///////////////////////////////////////////////////////////////////////////////