Launch the new default timeout value of 12s for autofill infobars.

Change the default timeout duration of password, credit card and address
infobars on iOS from 8 to 12s.

Keep the flags since we'll be experimenting again in a milestone when
the sticky infobar project launches.

Change-Id: I4b712435d525895d6aa9c2d93d1335db8f160df8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5412336


Reviewed-by: Vincent Boisselle <vincb@google.com>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Auto-Submit: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1281953}