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It was used to record field trials as Sync user events, but this feature
was abandoned a while ago.

Bug: 934762, 934333
Change-Id: I1606d5052bda03b1db64a2c084f05fe21c5cc9af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1557020Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#648638}