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kAppServiceAsh is the flag to integrate AppService in UI app_list.
Since it has been enabled for a few months for M78, M79 release, it
should not be disabled, so the flag kAppServiceAsh can be removed.

BUG=1016159

Change-Id: I0235521beb53bdda1b50c07e8a6e4e11298ba71c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895254Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712039}