LibWeb: Move setting of Web object prototypes to initialize()

This needs to happen before prototype/constructor intitialization can be
made lazy. Otherwise, GC could run during the C++ constructor and try to
collect the object currently being created.

Userland/Libraries/LibWeb/HTML/HTMLOptionElement.h

@@ -38,6 +38,8 @@ private:
 
     HTMLOptionElement(DOM::Document&, DOM::QualifiedName);
 
+    virtual void initialize(JS::Realm&) override;
+
     void parse_attribute(DeprecatedFlyString const& name, DeprecatedString const& value) override;
     void did_remove_attribute(DeprecatedFlyString const& name) override;