[CrOS MultiDevice] Remove ChromeCryptAuthService and its factory.

These classes are no longer used, but they were accidentally not removed
from https://chromium-review.googlesource.com/c/chromium/src/+/1367103.

Bug: 912743
Change-Id: I0ae960221b989a86c724fa720a77a8ef5e38ea82
Reviewed-on: https://chromium-review.googlesource.com/c/1385006
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#617938}
4 files changed