GitLab

The system salt is no longer needed for authentication.
Also remove unused PendingDoAuthenticateUser declaration.

Bug: 902161
Change-Id: I7920f2975cf4b547149caa2d0c7056085d6dab2a
Reviewed-on: https://chromium-review.googlesource.com/c/1318632
Commit-Queue: Quan Nguyen <qnnguyen@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605568}