LibWeb: Make NodeIterator GC-allocated

Author: https://github.com/awesomekling
Commit: bd629c45b5
Pull-request: https://github.com/SerenityOS/serenity/pull/14816
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/Forward.h

@@ -564,8 +564,6 @@ class MessagePortWrapper;
 class MouseEventWrapper;
 class MutationObserverWrapper;
 class MutationRecordWrapper;
-class NodeFilterWrapper;
-class NodeIteratorWrapper;
 class NodeListWrapper;
 class NodeWrapper;
 class OptionConstructor;