[Sync::USS] Expose the primary key in PasswordStoreChange

Bug: 902349
Change-Id: Ie4fa253d724b69f0a0d5f7265b5218b2df05851c
Reviewed-on: https://chromium-review.googlesource.com/c/1405249
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623755}
5 files changed