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- Associate the sync-setup row on the people page
  to the sync-controls page to make the sync controls
  searchable.
- Hide the sync controls when not available, so
  they don't show up during a search.

Additional:
 - Fix syncStatus update for settings-sync-controls
   when unified consent is disabled. (syncStatus
   wasn't used before.)

Bug: 916988
Change-Id: I5cc73cc32a03fb3960fe57e9075a16a6b31d2afe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1498531
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637908}