Dark Mode: update Settings loading shell

R=dpapad@chromium.org
BUG=883049

Change-Id: Idf98a94cc1767abc897a546767361447ad637e2b
Reviewed-on: https://chromium-review.googlesource.com/c/1377382
Commit-Queue: Dan Beam <dbeam@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616859}
1 file changed