Roll src/third_party/chromite b87974eebeaa..4fc8f1f8fe0e (3 commits)

https://chromium.googlesource.com/chromiumos/chromite.git/+log/b87974eebeaa..4fc8f1f8fe0e

git log b87974eebeaa..4fc8f1f8fe0e --date=short --no-merges --format='%ad %ae %s'
2019-09-24 yueherngl@google.com auron: remove jecht branch builders
2019-09-24 vapier@chromium.org goma: force running with python2
2019-09-24 lamontjones@chromium.org config: add cr50_firmware signing to cr50 builders.

Created with:
  gclient setdep -r src/third_party/chromite@4fc8f1f8fe0e

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/chromite-chromium-autoroll
Please CC chrome-os-gardeners@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

CQ_INCLUDE_TRYBOTS=luci.chromium.try:chromeos-kevin-rel
TBR=chrome-os-gardeners@google.com

Bug: None
Change-Id: Ibba45c749ed4522bf8270e44dca5ef30c31e24fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1823577Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#699527}

DEPS

@@ -853,7 +853,7 @@ deps = {
 
   # Build tools for Chrome OS. Note: This depends on third_party/pyelftools.
   'src/third_party/chromite': {
-      'url': Var('chromium_git') + '/chromiumos/chromite.git' + '@' + 'b87974eebeaa98e5df5c03ddf1c634b5ebd1fd42',
+      'url': Var('chromium_git') + '/chromiumos/chromite.git' + '@' + '4fc8f1f8fe0ee923a8b326916b1362510d972a42',
       'condition': 'checkout_linux',
   },