This would be a brutal beat down. Floyd too good at that weight. He'd make Broner's dad give him a chest rub while Broner combs his hair he had at the lower weights.
I think Floyd would beat him by a wide u.d. or KO depending on how good Broner's chin is. I am saying this based on what I have seen from these two fighters and not based on hate. Broner looks promising but I don't think he is going to be as good as Mayweather.