Web Api 2 HttpContext or HttpActionContext

Question

What is the difference between the following two ways of accessing the principle via an AuthorizeAttribute implementation?

Using HttpContext:

protected override bool IsAuthorized(HttpActionContext actionContext)
{
    return HttpContext.Current.User.IsInRole("DemoRole");
}

Using HttpActionContext:

protected override bool IsAuthorized(HttpActionContext actionContext)
{
    return actionContext.RequestContext.Principal.IsInRole("DemoRole");
}