LibJS+LibWeb: Use new Cell::Visitor helpers to avoid manual iteration

Author: https://github.com/awesomekling
Commit: 53d0dd4a2e
Pull-request: https://github.com/SerenityOS/serenity/pull/23971
Reviewed-by: https://github.com/trflynn89

Userland/Libraries/LibWeb/HTML/AudioTrackList.cpp

@@ -122,8 +122,7 @@ WebIDL::CallbackType* AudioTrackList::onremovetrack()
 void AudioTrackList::visit_edges(JS::Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
-    for (auto const& track : m_audio_tracks)
-        visitor.visit(track);
+    visitor.visit(m_audio_tracks);
 }
 
 }