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If IsSyncFeatureEnabled is false, then GetPreferredDataTypes doesn't
really mean anything.
In practice, this wasn't an actual issue: If Sync isn't enabled, then
the whole UserEventService can't upload anything anyway. But still best
to be precise here.

Bug: 907027, 856081
Change-Id: I2e3ee7200118175ed9397b5a1b7d9fedd0eb7692
Reviewed-on: https://chromium-review.googlesource.com/c/1344104Reviewed-by: vitaliii <vitaliii@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610022}