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These variables have type "AppListSyncableService*" but were named
"app_service". More recently, there is now a separate concept called
"the App Service":

https://chromium.googlesource.com/chromium/src/+/HEAD/chrome/services/app_service/README.md

Upcoming commits will integrate chrome/browser/ui/ash code with the App
Service. To avoid confusion, we first rename these "app_service"
variables to "syncable_service".

Change-Id: Idd69ac61d3dee9570ecc8ed368b5fa255e547821
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600927Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658362}