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/Services/WebContent/PageClient.cpp

@@ -126,8 +126,7 @@ void PageClient::visit_edges(JS::Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
     visitor.visit(m_page);
-    for (auto document : m_console_clients.keys())
-        visitor.visit(document);
+    visitor.visit(m_console_clients);
 }
 
 ConnectionFromClient& PageClient::client() const