Change logging of about:flags from actions to a histogram.
This CL deprecates all the "AboutFlags_*" actions and instead
replaces their logging with a AboutFlags.Seen histogram, that
has all the actions as enumerations.
This new histogram is logged using the same code that logs
Login.CustomFlags histogram on ChromeOS. Following this
change, via separate CLs I plan to deprecate Login.CustomFlags
in favor of AboutFlags.Seen and also make the new histogram
get logged on Android, where I think it's currently not logged.
BUG=639304
Review-Url: https://codereview.chromium.org/2257533005
Cr-Commit-Position: refs/heads/master@{#415410}
7 files changed
