Roll src/third_party/chromite 8e303f0eba46..a139c005963b (8 commits)

https://chromium.googlesource.com/chromiumos/chromite.git/+log/8e303f0eba46..a139c005963b

git log 8e303f0eba46..a139c005963b --date=short --first-parent --format='%ad %ae %s'
2020-02-20 vapier@chromium.org repo_util: add more encoding=utf-8 settings when we capture output
2020-02-20 vapier@chromium.org puppet_metrics_unittest: fix test assert for Python 3
2020-02-19 dburger@chromium.org Manual fix up of ge_build_config.json and config --update.
2020-02-19 dburger@chromium.org Add command line option to specify chrome preload directory.
2020-02-19 vapier@chromium.org cros_build_lib: run: drop error_code_ok backwards compat
2020-02-19 vapier@chromium.org cbuildbot_launch: switch to python3 only
2020-02-19 tcwang@google.com afdo: Fix Python3 compatibility of toolchain_util.py
2020-02-19 vapier@chromium.org contrib: force all modules to be python3 only

Created with:
  gclient setdep -r src/third_party/chromite@a139c005963b

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
Bug: None
Tbr: chrome-os-gardeners@google.com
Change-Id: I47e7a860c8e0b62431016e4810fdbb4b03ebd053
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066799Reviewed-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@{#743153}

DEPS

@@ -861,7 +861,7 @@ deps = {
 
   # Build tools for Chrome OS. Note: This depends on third_party/pyelftools.
   'src/third_party/chromite': {
-      'url': Var('chromium_git') + '/chromiumos/chromite.git' + '@' + '8e303f0eba46c0efede176684f54411b4d882bc1',
+      'url': Var('chromium_git') + '/chromiumos/chromite.git' + '@' + 'a139c005963b98e538cb20a0c40266f61b107bb4',
       'condition': 'checkout_linux',
   },