Chrome OS: Remove dead code of Host/Controller pairing screens.

Bug: 856337
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I1fc6d0eff37bdb3f7c2175861782652ee028c4b2
Reviewed-on: https://chromium-review.googlesource.com/c/1114240
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Zachary Kuznia <zork@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616947}
76 files changed