Findit identified the culprit r580436 with confidence 100.0% in the config "chromium.memory / Linux MSan Tests"
based on the flakiness trend:

https://findit-for-me.appspot.com/waterfall/flake?key=ag9zfmZpbmRpdC1mb3ItbWVyigILEhdNYXN0ZXJGbGFrZUFuYWx5c2lzUm9vdCLTAWNocm9taXVtLm1lbW9yeS9MaW51eCBNU2FuIFRlc3RzLzExMDUxL25vdF9zaXRlX3Blcl9wcm9jZXNzX3N5bmNfaW50ZWdyYXRpb25fdGVzdHMvVlZOVEwxUjNiME5zYVdWdWRFSnZiMnR0WVhKcmMxTjVibU5VWlhOMFNXNWpiSFZrYVc1blZYTnpWR1Z6ZEhNdVRVTmZUbTl1Ulcxd2RIbEdiMnhrWlhKT1lXMWxRMmhoYm1kbFFXNWtSR1ZzWlhScGIyNURiMjVtYkdsamRDOHcMCxITTWFzdGVyRmxha2VBbmFseXNpcxgBDA

If the culprit above is wrong, please file a bug using this link and hit submit:
https://bugs.chromium.org/p/chromium/issues/entry?status=Unconfirmed&labels=Pri-1,Test-Findit-Wrong&components=Tools%3ETest%3EFindit%3EFlakiness&summary=%5BFindit%5D%20Flake%20Analyzer%20-%20Wrong%20result%20for%20USS/TwoClientBookmarksSyncTestIncludingUssTests.MC_NonEmptyFolderNameChangeAndDeletionConflict/0&comment=Link%20to%20Analysis%3A%20https://findit-for-me.appspot.com/waterfall/flake?key=ag9zfmZpbmRpdC1mb3ItbWVyigILEhdNYXN0ZXJGbGFrZUFuYWx5c2lzUm9vdCLTAWNocm9taXVtLm1lbW9yeS9MaW51eCBNU2FuIFRlc3RzLzExMDUxL25vdF9zaXRlX3Blcl9wcm9jZXNzX3N5bmNfaW50ZWdyYXRpb25fdGVzdHMvVlZOVEwxUjNiME5zYVdWdWRFSnZiMnR0WVhKcmMxTjVibU5VWlhOMFNXNWpiSFZrYVc1blZYTnpWR1Z6ZEhNdVRVTmZUbTl1Ulcxd2RIbEdiMnhrWlhKT1lXMWxRMmhoYm1kbFFXNWtSR1ZzWlhScGIyNURiMjVtYkdsamRDOHcMCxITTWFzdGVyRmxha2VBbmFseXNpcxgBDA

Automatically posted by the findit-for-me app (https://goo.gl/Ot9f7N).

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c0439d22bf577600fde02f6d4919da679224447e

commit c0439d22bf577600fde02f6d4919da679224447e
Author: Balazs Engedy <engedy@chromium.org>
Date: Fri Aug 03 11:55:53 2018

Revert "Reland "[Sync::USS] Bookmark sync conflict resolution""

This reverts commit a445460b34772c35f3c43b76a8c08177d70fda1d.

Reason for revert:

MSAN warning in USS/TwoClientBookmarksSyncTestIncludingUssTests.CreateSyncedBookmarks

See:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20MSan%20Tests/11051
https://chromium-swarm.appspot.com/task?id=3f17cf427082ec10&refresh=10&show_raw=1

Original change's description:
> Reland "[Sync::USS] Bookmark sync conflict resolution"
>
> This is a reland of 553ec6dab428099a9b73418e016c68f4d45edbf8
>
> Original change's description:
> > [Sync::USS] Bookmark sync conflict resolution
> >
> > This patch addresses the problem of conflict in bookmarks upon
> > receiving a remote update for a node that has local changes.
> >
> > The general polic that is implemented is that server wins except in
> > case of deletion.
> >
> > Bug: 516866
> > Change-Id: I50a85bde068dd9414e4e22bc1a33529fb3dfffa1
> > Reviewed-on: https://chromium-review.googlesource.com/1157006
> > Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
> > Reviewed-by: Mikel Astiz <mastiz@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#580436}
>
> Bug: 516866
> Change-Id: I73bb31e143aa7baadd5fa8c0afd3d91554c9aa6e
> Reviewed-on: https://chromium-review.googlesource.com/1161861
> Reviewed-by: Mikel Astiz <mastiz@chromium.org>
> Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#580496}

TBR=mastiz@chromium.org,mamir@chromium.org

Change-Id: I22a2a0f518fdbefe7baa3c4840884090459e62a3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 516866,  870668 
Reviewed-on: https://chromium-review.googlesource.com/1161884
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580509}
[modify] https://crrev.com/c0439d22bf577600fde02f6d4919da679224447e/chrome/browser/sync/test/integration/two_client_bookmarks_sync_test.cc
[modify] https://crrev.com/c0439d22bf577600fde02f6d4919da679224447e/components/sync_bookmarks/bookmark_remote_updates_handler.cc
[modify] https://crrev.com/c0439d22bf577600fde02f6d4919da679224447e/components/sync_bookmarks/bookmark_remote_updates_handler.h
[modify] https://crrev.com/c0439d22bf577600fde02f6d4919da679224447e/components/sync_bookmarks/synced_bookmark_tracker.cc
[modify] https://crrev.com/c0439d22bf577600fde02f6d4919da679224447e/components/sync_bookmarks/synced_bookmark_tracker.h
[modify] https://crrev.com/c0439d22bf577600fde02f6d4919da679224447e/components/sync_bookmarks/synced_bookmark_tracker_unittest.cc

I have reverted this again, assigning it to mamir@ for permanent fix.

Test deleted