Roll src/third_party/chromite 8df216c09227..1a9881e19baa (2 commits)

https://chromium.googlesource.com/chromiumos/chromite.git/+log/8df216c09227..1a9881e19baa

git log 8df216c09227..1a9881e19baa --date=short --no-merges --format='%ad %ae %s'
2019-09-03 vapier@chromium.org image_lib: remove au-generator.zip support
2019-09-03 chrome-bot@chromium.org Update config settings by config-updater.

Created with:
  gclient setdep -r src/third_party/chromite@1a9881e19baa

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: I8f74037c6b44a8b22b933f7f225ac35b75720232
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1783737Reviewed-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@{#692939}

DEPS

@@ -842,7 +842,7 @@ deps = {
 
   # Build tools for Chrome OS. Note: This depends on third_party/pyelftools.
   'src/third_party/chromite': {
-      'url': Var('chromium_git') + '/chromiumos/chromite.git' + '@' + '8df216c09227479cb1fd05aba10e393d0dfb5601',
+      'url': Var('chromium_git') + '/chromiumos/chromite.git' + '@' + '1a9881e19baa6acb5bc140b87d0765cae8acac8b',
       'condition': 'checkout_linux',
   },