GitLab

Re-adding a line that initialized the layout manager. This line
was deleted in http://crrev.com/c/1817149 which led to the
"Shut down" button becoming not clickable.

Bug: 1014774
Test: manual
Change-Id: Ib2b8004a0c296f2d3355768e54bd9bc9b1331192
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891140Reviewed-by: Manu Cornet <manucornet@chromium.org>
Commit-Queue: Vladislav Kaznacheev <kaznacheev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711347}