Where is DefaultRenderMvcControllerResolver located in Umbraco Api

Question

For custom controller hijacking as mentioned umbraco documentation here Custom controllers (Hijacking Umbraco Routes)

I am not unable to find the namespace and assembly for the class mentioned as DefaultRenderMvcControllerResolver for the code snippet below,

public class MyApplication : UmbracoApplication
{
    protected override void OnApplicationStarting(object sender, EventArgs e)
    {
        DefaultRenderMvcControllerResolver.Current.SetDefaultControllerType(typeof(MyCustomUmbracoController));
        base.OnApplicationStarting(sender, e);
    }
}

Answer 1

The namespace is Umbraco.Web.Mvc but only available from v6.1 onwards I think.

All the code is open source and available at https://github.com/umbraco/Umbraco-CMS