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There was one crash report in this method, but the crash did not seem to include
local variables. Log the value of authentication_stage_ to capture it.

Bug: 820671
Change-Id: I82c25b8a58f0993a9eef94c497c2c3e06c48b255
Reviewed-on: https://chromium-review.googlesource.com/1015880Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553372}