i was bought up on a farm and rode my bike around slippery grass paddocks. I soon learned that applying the front brake going into corners had consequences like sliding off into probably cow shyte!...
I think this has taught me not to front brake whilst in corners and i always do my braking if required prior to leaning into a corner...i honestly cannot recall ever front braking whilst in a corner...or rear for that matter...i'll use the gears before i use the brakes setting my speed so i can ride the bike around the corner to my ability. If i need to brake as well its while im still upright then off the brake and into the corner..