[Sync::USS] Introduce PasswordStoreSync::RemoveLoginByPrimaryKeySync()

This patch introduces a new method to remove logins given the DB
primary key.

This will be used in later patches.

Bug: 902349
Change-Id: I9c2bf659dbb9e4710ef1469b0296b836a0212301
Reviewed-on: https://chromium-review.googlesource.com/c/1430008
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625267}
10 files changed