[Sync::USS] Rename PasswordModelTypeController class

This CL renames PasswordModelTypeController class.
Currently it is used for the Pseudo USS implementation as an intermediate
stage till releasing the full-blown USS implementation for passwords.

We should reserve that name for the full-blown implementation.

Bug: 902349
Change-Id: I01b9df1e9e4afcb0307f58a95172769a9f249f18
Reviewed-on: https://chromium-review.googlesource.com/c/1320170
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606001}
4 files changed