CryptAuth: Remove unused FakeCryptAuthDeviceIdProvider.

R=khorimoto@chromium.org

Bug: 899324
Test: none
Change-Id: I764a9dc6f2d38f896a8d7ec41f15a834e5bbba85
Reviewed-on: https://chromium-review.googlesource.com/c/1330842
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: James Hawkins <jhawkins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607271}
3 files changed