This reverts commit 35c62742.

Reason for revert: Causing official branch failures: http://shortn/_AGHUiAf5Fu

Original change's description:
> Add GCLIENT_DEP_REF env var for recurse command
>
> The goal of this change is to facilitate analyzing DEPS autorolls https://crrev.com/c/2250928
>
> Change-Id: Icbebd144a85f7e24aa638f93d8c30f3f0aab1e5c
> Bug: 923016
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2239069
> Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
> Commit-Queue: Gregory Guterman <guterman@google.com>

TBR=ehmaldonado@chromium.org,guterman@google.com,infra-scoped@luci-project-accounts.iam.gserviceaccount.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 923016
Change-Id: I23ef45c90250441bf02cd956a446c0cf8b0bbcf7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2255567
Auto-Submit: Ben Mason <benmason@chromium.org>
Reviewed-by: Ben Mason <benmason@chromium.org>
Commit-Queue: Ben Mason <benmason@chromium.org>