FindIt result: https://findit-for-me.appspot.com/waterfall/flake?redirect=1&key=ag9zfmZpbmRpdC1mb3ItbWVyrgELEhdNYXN0ZXJGbGFrZUFuYWx5c2lzUm9vdCJ4Y2hyb21pdW0ubGludXgvTGludXggVGVzdHMvNTk1NjYvYnJvd3Nlcl9zaWRlX25hdmlnYXRpb25fdW5pdF90ZXN0cy9RWEJ3UkdGMFlVMXBaM0poZEc5eVZHVnpkQzVHYVd4bFUzbHpkR1Z0VFdsbmNtRjBhVzl1DAsSE01hc3RlckZsYWtlQW5hbHlzaXMYAQw

I think that only shows that the flakiness started more than 200 runs ago, which we also know from the flakiness dashboard.

This test was last modified a year ago by fdoray in a CL that wasn't supposed to change behavior: https://chromium.googlesource.com/chromium/src/+/cb32419d7ec55e6c37379c4f1d0e969eefe38f73.

Before that was the patch that added the test: https://chromium.googlesource.com/chromium/src/+/48bedbd2773df847e5dbf1c01fb409da4636d542.

The findit analysis seems to still be running, so maybe that will find something.

Flakiness dashboard link: https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=browser_side_navigation_unit_tests&tests=AppDataMigratorTest.FileSystemMigration

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/964e8be1a2270b84dd34ac4d9503d2818e35faa1

commit 964e8be1a2270b84dd34ac4d9503d2818e35faa1
Author: Ojan Vafai <ojan@chromium.org>
Date: Mon Jul 24 23:54:30 2017

Disable AppDataMigratorTest.FileSystemMigration

It's flaky. See bug for details.

BUG=747589
TBR=rdevlin.cronin@chromium.org

Change-Id: Iaa9ceabe1aa86829b5d2c1773857d92356786b11
Reviewed-on: https://chromium-review.googlesource.com/583994
Commit-Queue: Ojan Vafai <ojan@chromium.org>
Reviewed-by: Ojan Vafai <ojan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489148}
[modify] https://crrev.com/964e8be1a2270b84dd34ac4d9503d2818e35faa1/chrome/browser/extensions/app_data_migrator_unittest.cc