LibWeb: Move passing of Web object prototypes out of constructors

Author: https://github.com/trflynn89
Commit: af75493883
Pull-request: https://github.com/SerenityOS/serenity/pull/16945
Reviewed-by: https://github.com/alimpfard

Userland/Libraries/LibWeb/DOM/NamedNodeMap.cpp

@@ -20,11 +20,17 @@ JS::NonnullGCPtr<NamedNodeMap> NamedNodeMap::create(Element& element)
 }
 
 NamedNodeMap::NamedNodeMap(Element& element)
-    : Bindings::LegacyPlatformObject(Bindings::cached_web_prototype(element.realm(), "NamedNodeMap"))
+    : Bindings::LegacyPlatformObject(element.realm())
     , m_element(element)
 {
 }
 
+void NamedNodeMap::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+    set_prototype(&Bindings::ensure_web_prototype<Bindings::NamedNodeMapPrototype>(realm, "NamedNodeMap"));
+}
+
 void NamedNodeMap::visit_edges(Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);