FunctionState doesn't need to know AstNodeFactory.

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index 280f1df5f855c4e096b926a342c1d71d43072367..1046459cce390fff6d31f197e5695b9e945ef714 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -1049,9 +1049,8 @@ class PreParser : public ParserBase<PreParserTraits> {
       scope = NewScopeWithParent(scope, MODULE_SCOPE);
     }
 
-    PreParserFactory factory(nullptr);
     FunctionState top_scope(&function_state_, &scope_state_, scope,
-                            kNormalFunction, &factory);
+                            kNormalFunction);
     bool ok = true;
     int start_position = scanner()->peek_location().beg_pos;
     parsing_module_ = is_module;