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/DocumentState.cpp

@@ -39,9 +39,7 @@ void DocumentState::visit_edges(Cell::Visitor& visitor)
     Base::visit_edges(visitor);
     visitor.visit(m_document);
     for (auto& nested_history : m_nested_histories) {
-        for (auto& entry : nested_history.entries) {
-            visitor.visit(entry);
-        }
+        visitor.visit(nested_history.entries);
     }
 }