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This is a reland of 5d6ecbfb

The failing Tast test (ui.ShelfLaunchedApps) has been updated to
ensure it continues passing after this CL is landed.

This is the second of a chain of 3 CLs:

1. crrev.com/c/2538305: Allow Files app to be pinned by default in
   ui.ShelfLaunchedApps
2. crrev.com/c/2538857: Add Files app to default shelf pins in second
   position
3. crrev.com/c/2538307: Update ui.ShelfLaunchedApps to ensure Chrome and
   Files are always pinned

Original change's description:
> CrOS: Add Files app to default shelf pins in second position
>
> This adds the Files app to the spot after the Chrome icon, for new users
> only. There's also some variations of the default pin layout controlled
> by a Finch experiment, I've moved the Files app up in those layouts for
> consistency.
>
> This change was requested for M88 and will be merged back.
>
> Bug: 1148519
> Change-Id: Iae54561fec599b813ba97e82a5678fa834a02db2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537214
> Reviewed-by: Dominick Ng <dominickn@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
> Auto-Submit: Tim Sergeant <tsergeant@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#827272}

Bug: 1148519
Change-Id: I9186b43a651dea4c4de9e46f849d35da9cc6062c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538857Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Tim Sergeant <tsergeant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827981}