No Sir, the barrels are not chrome lined.
The chroming process is utilized in rifles to help protect rifling and extend the life of the barrel. Aside from steel shot, most common shotgun ammunition is lead and much softer than the steel barrel itself. In addition, the wad in most shotgun ammunition encases the shot as it travels through the barrel preventing direct contact with the bore surface. There is simply no need for the chroming process in most shotguns, so there is no justification for the added cost...