GitLab

kAppServiceShelf will be removed in M82 release, so this is the
pareparing for that. I will follow up to remove more stuff, then finally
remove that flag.

BUG=1016159

Change-Id: I3da4b9e304a182e742f58cf59fc548818fefb13c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037172Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738342}