jlklein@ - could you please take a look? I don't want to revert you CL a second time if it can be avoided, but we do need to figure out this flakiness.

Somehow this flakiness is specific to single_process_mash_browser_tests. Some Mash specific changes may be the cause. I'll filter the test for Mash for now.
https://chromium-review.googlesource.com/c/chromium/src/+/1280854

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c27e10f26efe5aeb3aabf645687d2b6172bf8d1e

commit c27e10f26efe5aeb3aabf645687d2b6172bf8d1e
Author: Jun Mukai <mukai@chromium.org>
Date: Mon Oct 15 18:25:40 2018

filter 3 more flaky tests on single_process_mash

The following tests are flaky only on SingleProcessMash.

BUG= 895070 ,  895110 ,  895068 
TEST=None
TBR=sky@chromium.org

Change-Id: I38c1ce550e00472933dbd16fcddec1d6b7af0e54
Reviewed-on: https://chromium-review.googlesource.com/c/1280854
Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599685}
[modify] https://crrev.com/c27e10f26efe5aeb3aabf645687d2b6172bf8d1e/testing/buildbot/filters/chromeos.single_process_mash.browser_tests.filter

Mukai@, should this and https://bugs.chromium.org/p/chromium/issues/detail?id=895068 just be marked fixed now?

I'm not sure if we can mark as fixed since the bug is not gone yet. My CL just added a filter rule for the bot.

It's okay to be owned by myself. I (or someone in charge of mustash rotation) can mark as fixed when we're sure it's gone.

Sounds good, thanks! Let us know if you still need anything from us.

Assigned the new rotation of mustash sheriff.

So far I couldn't reproduce the failure locally, maybe we can re-enable it and see how it goes.