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/CSS/MediaList.h

@@ -39,6 +39,8 @@ public:
 private:
     MediaList(JS::Realm&, NonnullRefPtrVector<MediaQuery>&&);
 
+    virtual void initialize(JS::Realm&) override;
+
     NonnullRefPtrVector<MediaQuery> m_media;
 };