NPError
PluginModuleParent::NPP_NewStream(NPP instance, NPMIMEType type,
                                  NPStream* stream, NPBool seekable,
                                  uint16_t* stype)
{
    PluginInstanceParent* i = InstCast(instance);
    if (!i)
        return NPERR_GENERIC_ERROR;

    return i->NPP_NewStream(type, stream, seekable,
                            stype);
}