[serializer] pass internal fields deserializer callback as argument.

src/snapshot/partial-serializer.cc

Index: src/snapshot/partial-serializer.cc
diff --git a/src/snapshot/partial-serializer.cc b/src/snapshot/partial-serializer.cc
index 66aafb5368b7c5e907b348363eaf2350e333332c..a141aac19339b9fa32da323ca755122b5ed7e7e9 100644
--- a/src/snapshot/partial-serializer.cc
+++ b/src/snapshot/partial-serializer.cc
@@ -102,7 +102,10 @@ void PartialSerializer::SerializeObject(HeapObject* obj, HowToCode how_to_code,
 
   if (obj->IsJSObject()) {
     JSObject* jsobj = JSObject::cast(obj);
-    if (jsobj->GetInternalFieldCount() > 0) internal_field_holders_.Add(jsobj);
+    if (jsobj->GetInternalFieldCount() > 0) {
+      DCHECK_NOT_NULL(serialize_internal_fields_);
+      internal_field_holders_.Add(jsobj);
+    }
   }
 
   // Object has not yet been serialized.  Serialize it here.