This reverts commit 9ca89ac1.

Reason for revert: Breaks git cl st

Original change's description:
> Add option to git cl st to sort by committer date
>
> Some developers want to see the branches with recent commits first.
> This CL adds the option --dateorder to git cl st which sorts branches
> by the committer date of the most recent branch.
>
> Change-Id: Ibdf3fc35ea784521a3e99b374535f822bb83a55e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2521573
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Josip Sokcevic <sokcevic@google.com>
> Reviewed-by: Dirk Pranke <dpranke@google.com>

TBR=dpranke@google.com,sigurds@chromium.org,infra-scoped@luci-project-accounts.iam.gserviceaccount.com,sokcevic@google.com

Tbr: dpranke@google.com
Change-Id: I3ed44d42b8383691682442567e3151508126fbd5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2532834
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Auto-Submit: Sigurd Schneider <sigurds@chromium.org>