Smart Lock: Remove SendAuthAttempt calls.

This method did nothing given that no event listener was registered for
the auth attempt listener in the WebUI.

R=hansberry@chromium.org

Bug: 899324
Test: none
Change-Id: I4f46d553ee95538a468b05a434f609ab60c7ca52
Reviewed-on: https://chromium-review.googlesource.com/c/1312300
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: James Hawkins <jhawkins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604625}
15 files changed