chromeos: remove dead code

AFAICT this code is not used at all.

BUG=none
TEST=none

Change-Id: I835a8a5398ec18af85ec819a828febbd7a2c615d
Reviewed-on: https://chromium-review.googlesource.com/526037
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#477436}
3 files changed