This reverts commit 2b29d0f8.

Reason for revert: may be causing crbug/1238425

Original change's description:
> Fix invalid reference: refs/remotes/origin/HEAD error
>
> Change-Id: Iac298a7a14b5c0b55fd199ec120fe5c37ef88fdc
> Bug: 1178944
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2757129
> Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
> Commit-Queue: Gavin Mak <gavinmak@google.com>

Bug: 1178944, 1238425
Change-Id: I131b8a347486b70289bf78978738e1a64bd460e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3086970Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>