This reverts commit 867e3c95.

Reason for revert: Fails to apply patch onto a branch head.
Example failure: https://ci.chromium.org/p/webrtc/builders/try/linux_compile_rel/13395
vs previous successful run: https://ci.chromium.org/p/webrtc/builders/try/linux_compile_rel/13307

Original change's description:
> Reland "bot_update: Pass target-ref to gclient."
>
> This is a reland of f61af569
>
> gclient was updated to handle these refs on
> https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1590495
>
> Original change's description:
> > bot_update: Pass target-ref to gclient.
> >
> > Bug: 956807
> > Recipe-Nontrivial-Roll: infra
> > Recipe-Nontrivial-Roll: skia
> > Recipe-Nontrivial-Roll: build_limited_scripts_slave
> > Recipe-Nontrivial-Roll: build
> > Change-Id: I4d786d989446b8c1e3f39ef78c3c99cfe70808c0
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1588502
> > Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
> > Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
>
> Bug: 956807
> Recipe-Nontrivial-Roll: infra
> Recipe-Nontrivial-Roll: build_limited_scripts_slave
> Recipe-Nontrivial-Roll: build
> Change-Id: I06b2b517d3f1aeb0a12b7c5fc58f1621533dae5c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1592214
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
> Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>

TBR=nodir@chromium.org,tandrii@chromium.org,ehmaldonado@chromium.org

Bug: 956807, webrtc:10406
Recipe-Nontrivial-Roll: infra
Recipe-Nontrivial-Roll: skia
Recipe-Nontrivial-Roll: build_limited_scripts_slave
Recipe-Nontrivial-Roll: build
Change-Id: I6db0802e1951c3241d0a3c080bea51423582cb3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1593052
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Oleh Prypin <oprypin@chromium.org>
Auto-Submit: Oleh Prypin <oprypin@chromium.org>