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Chrome OS used to use the mojo preferences service, which required
prefs used across the browser/ash boundary to be flagged as PUBLIC.
Since mustash was cancelled we don't use the mojo service any more,
so the flag isn't needed.

This helps clarify which prefs are still actually using the mojo
preference service (e.g. assistant).

This CL is just cleanup, no behavior changes expected.

Bug: none
Change-Id: I4f53ff4f1dcaba600a797f61774c186459c751aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869672
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707566}