[Sync::USS] Persist metadata upon local password change

Bug: 902349
Change-Id: Icb47bba418b6dc0a9c10631f88aff974a5e15ad9
Reviewed-on: https://chromium-review.googlesource.com/c/1418050
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624757}
6 files changed