[Sync::USS] Clean corrupted password sync metadata from login database

During experimentation phase, passwords sync metadata got corrupted
when trying different approaches during the USS passwords sync launch.

This CL is pumping up the database version and clean any
potentially corrupted sync metadata.

This is safe because the corrupted version influenced only
Canary and Dev users, and hence very small number of users should
be affected.

This CL only clears the sync metadata and doesn't remove any password
data. Users will then automatically go through the first sync
experience!

Bug: 902349
Change-Id: If6179c814045b24c16aff8d34b769dc8fe14aaad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625114
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@{#662571}
3 files changed