Chrome Version: M58, M59
OS: Android

The background migration from document mode to tabbed mode only happens on platforms < N in M58 and M59, when the intent was for it to not happen on Android O. This change was done in: https://chromium.googlesource.com/chromium/src/+/7b2685fe8d54b71fc8d9f5990a62b63fd870bc63

However, some time after that CL landed, we now, across M58, M59 and M60 we have a handy method BuildInfo#isAtLeastO() we can use instead, and that is currently what we have in master (M60).

We should use that method instead of |if (Build.VERSION.SDK_INT > Build.VERSION_CODES.N)|.

However, from what I can tell from the code it looks like the migration will nevertheless happen when the user starts up the browser manually, so this might not be a big issue in practice, and instead just be to make the user have a better experience in those cases.

First of all, probably most users have upgraded by now, and secondly, if it works regardless, that might be fine then.