This reverts commit d9011c559b.
Reason for revert: Breaks ChromeOS staging builders: b/296139378
Original change's description:
> Set --git-dir for git commands that may be executed in bare gits.
>
> Bug:b/294415576
> Change-Id: I18ca8ebebf95e1c31e30aa1f5d62da3467df940f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4778199
> Auto-Submit: Joanna Wang <jojwang@chromium.org>
> Reviewed-by: Gavin Mak <gavinmak@google.com>
> Commit-Queue: Joanna Wang <jojwang@chromium.org>
Bug: b/294415576
Change-Id: Ie16f16a405fbdea4d925e03a0cfd1ac0260bb2d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4784102
Commit-Queue: Jack Neus <jackneus@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Joanna Wang <jojwang@chromium.org>