GitLab

This CL removes buttons on initial connecting UI and reconnecting UI to
reflect the spec change.

Screenshots:
https://screenshot.googleplex.com/A6TprYL3kKm2q29.png
https://screenshot.googleplex.com/AdmCtFgv4RqfMow.png

BUG=1106937,1126208

Change-Id: Iff74b3168d6af80f17debf7be39af394e52da161
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438983
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812538}