GitLab

To support certain use cases the current upgrade strategy
can't be used. This cl changes all upgrades to N-1 strategy.

Bug: 461856
Change-Id: Ic7a7580e6e2e51b65428cddaca1209a3edc0af5b
Reviewed-on: https://chromium-review.googlesource.com/1013222Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: James Meade <mmeade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551495}