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When Nearby Share is not yet set up, we'll show a "Set Up" button on the
settings row instead of the toggle.

Screenshot:
  https://screenshot.googleplex.com/4WXi2TR865p4jbm.png

Fixed: 1154767
Change-Id: I919aad75bcea98963ca75b21fbaf938a7e132dd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573856
Commit-Queue: Michael Hansen <hansenmichael@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833972}