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This CL stops logging into, and deprecates:
PasswordManager.EmptyUsernames.TextAndPasswordFieldCount and
PasswordManager.EmptyUsernames.PasswordFieldCount.

Those metrics were used for an investigation, which has concluded back
in 2016.

Bug: 852772
Change-Id: Ib15807b8384d9053d8df7e09465bbef16f9145fa
Reviewed-on: https://chromium-review.googlesource.com/1209503Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Vaclav Brozek <vabr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589293}