GitLab

Other empty containers are marked as const to ensure that they stay
empty.

Change-Id: I6771a853cf3cde47fcdcff1e3af7862234f04683
Reviewed-on: https://chromium-review.googlesource.com/c/1298399Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602520}