Revert of Implementation of a full screen app list and re-alphabetized switches (patchset #11 id:440001 of https://codereview.chromium.org/2802903003/ )

Reason for revert:
Suspecting that this breaks ash_unittests

Original issue's description:
> Implementation of a full screen app list behind a switch (as opposed to a feature flag).
>
> Also re-alphabetized switches in ash_switches.cc
>
> BUG=711349
>
> Review-Url: https://codereview.chromium.org/2802903003
> Cr-Commit-Position: refs/heads/master@{#467088}
> Committed: https://chromium.googlesource.com/chromium/src/+/23bdfdaf36a0e72e57e6bcf909d87fd4f5d5c663

TBR=sky@chromium.org,newcomer@chromium.org,newcomer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=711349

Review-Url: https://codereview.chromium.org/2840993002
Cr-Commit-Position: refs/heads/master@{#467181}
12 files changed