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Unless |fast_timeout| is used (which will maintain previous behavior
of timing out immediately after the last attempt), on fallback of the
last attempt, a timer is run to time out the transaction.

Also doing the same on errors with the last attempt as long as at least
one previous attempt is still pending. And the transaction will also
return errors immediately if it was from the last pending attempt.

Bug: 1109792
Change-Id: Ibc8ed54428fcba247ed3526fa41584e27a118e81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464068
Commit-Queue: Eric Orth <ericorth@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818606}