Android/Play Store allows browsers that have their own rendering engine. Apple does not.
(Sorry, I missed the BB10/Android part...)
Chrome on iOS, as well (and ALL other iOS browsers loaded from App Store) use either UIWebView (would have to be very old browser...) or WKWebview. WKWebView is what Safari uses.
So, on iOS, FWIW, Chrome is not really Chrome. (And Opera is not really Opera.) It is WKWebView wrapped in controls that mimic real Chrome or Opera.
Somebody might try Opera for Chrome on some recent Android device. Since BB10 rides on Android, it's likely to act the same as BB10.