This reverts commit 355b11a3.

Reason for revert:
Easier to do this another way that doesn't cause expectation changes,
so it doesn't require non-trivial rolls.

Original change's description:
> bot_update: Patch on gclient by default.
> 
> See [4] for the design doc for this change.
> 
> We're moving the patching logic from bot_update to gclient.
> This way we can test patches of dependencies that modify their DEPS
> files as well, for example when ANGLE uploads a patch that modifies
> DEPS files to be tested by a Chromium trybot.
> 
> Chromium Linux CQ and Angle trybots are already running this way
> (see [1] and [2]) and a PSA has already been sent [3]
> 
> [1] https://chromium.googlesource.com/chromium/src/+/master/infra/config/global/cr-buildbucket.cfg#214
> [2] https://chromium.googlesource.com/angle/angle/+/infra/config/cr-buildbucket.cfg#105
> [3] https://groups.google.com/a/google.com/forum/#!topic/chrome-infra/FVHN2kdUX4I
> [4] https://docs.google.com/document/d/1GSTw4ysm5AYjNR6vMA7NJUxLK2VN9IpOEp_v0u-wyOE/edit?ts=5ad78165#
> 
> Bug: 643346
> Change-Id: Ic9a9dcfae86aca730d35fbb26c26b21135e05bf3
> Recipe-Nontrivial-Roll: skia
> Recipe-Nontrivial-Roll: infra
> Recipe-Nontrivial-Roll: build_limited_scripts_slave
> Recipe-Nontrivial-Roll: skiabuildbot
> Recipe-Nontrivial-Roll: build
> Recipe-Nontrivial-Roll: release_scripts
> Reviewed-on: https://chromium-review.googlesource.com/1014356
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
> Reviewed-by: Aaron Gable <agable@chromium.org>

TBR=agable@chromium.org,ehmaldonado@chromium.org

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

Bug: 643346
Change-Id: I0e694b0e398770b8bd2e5a3170e158a7e54c5a61
Reviewed-on: https://chromium-review.googlesource.com/1029310Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>