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This change adds the restore path, but usernames are not currently
saved.

BUG=891462

Change-Id: I045fa9d1624a84dd95892e7b3c45d8b303992ef5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1644321
Commit-Queue: Anand Mistry <amistry@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666198}