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- Shares that require credentials are no longer remembered.
- Previously, all shares would be persisted regardless of whether or
  not they had credentials.
- A future CL will resume persistence on all shares.

Bug: chromium:913691
Test: emerges
Change-Id: I7dd5290d8b5af60bf6a9d14ac69e2bef5ba6c1c2
Reviewed-on: https://chromium-review.googlesource.com/c/1372915Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619796}