Remove unused PATCH_TOOL and resulting dead code from bot_update.

Remove unused PATCH_TOOL and resulting dead code from bot_update.

R=agable@chromium.org, estaab@chromium.org, hinoka@chromium.org, martiniss@chromium.org
BUG=643885
Committed: https://chromium.googlesource.com/chromium/tools/depot_tools/+/3dd7436899f87b0bb1538b43c4332e327fd70a98

[agable, 2016-09-09 01:11:39]

lgtm

[iannucci, 2016-09-09 01:11:58]

https://chromiumcodereview.appspot.com/2328883002/diff/1/recipe_modules/bot_u...
File recipe_modules/bot_update/resources/bot_update.py (left):

https://chromiumcodereview.appspot.com/2328883002/diff/1/recipe_modules/bot_u...
recipe_modules/bot_update/resources/bot_update.py:788: refs, git_cache_dir,
gerrit_reset):
gyp_env and runhooks were leftovers from a previous CL.

[iannucci, 2016-09-09 01:13:31]

The CQ bit was checked by iannucci@chromium.org

[commit-bot: I haz the power, 2016-09-09 01:13:35]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-09 01:19:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-09 01:19:25]

Try jobs failed on following builders:
  Depot Tools Presubmit on luci.infra.try (JOB_FAILED,
https://luci-milo.appspot.com/swarming/task/3125537bf8bf4310)

[iannucci, 2016-09-09 01:24:49]

The CQ bit was checked by iannucci@chromium.org

[iannucci, 2016-09-09 01:24:50]

The patchset sent to the CQ was uploaded after l-g-t-m from agable@chromium.org
Link to the patchset: https://codereview.chromium.org/2328883002/#ps20001
(title: "Fix "test"")

[commit-bot: I haz the power, 2016-09-09 01:24:55]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-09 01:27:51]

Description was changed from

==========
Remove unused PATCH_TOOL and resulting dead code from bot_update.

R=agable@chromium.org, estaab@chromium.org, hinoka@chromium.org,
martiniss@chromium.org
BUG=643885
==========

to

==========
Remove unused PATCH_TOOL and resulting dead code from bot_update.

R=agable@chromium.org, estaab@chromium.org, hinoka@chromium.org,
martiniss@chromium.org
BUG=643885

Committed:
https://chromium.googlesource.com/chromium/tools/depot_tools/+/3dd7436899f87b...
==========

[commit-bot: I haz the power, 2016-09-09 01:27:52]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/tools/depot_tools/+/3dd7436899f87b...