cros: Deprecate kStateStart

This has evolved to be the same thing as kStateApps, and having both
around is a bit confusing, so remove it and replace it with kStateApps.

Bug: 944138
Change-Id: Icf678a2f3143db8cd7d01faf7a3fabc05f243d2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1534496
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643378}
12 files changed