Ray,
While it's not likely that it's cracked, it could be possible. Chrome lining is extremely thin and would not likely crack or peel. Embrittlement from the chrome process shouldn't be an issue either. I'm guessing it's not cracked. I'd recommend you borescope it before having the dent removed. When the dent is removed, a crack would close up and you may not find it. Find someone with a borescope, usually riflesmiths use them. I'm guessing there's debris in there making it looked cracked. But you need to know for sure.