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The "late registration" feature was added to support the mustash
project, which was running the ash system UI in a separate process.
Mustash was cancelled, so we now guarantee that all ash prefs
are registered before the sync subsystem starts.

Remove the whitelist. This is a manual revert of:
https://chromium-review.googlesource.com/c/chromium/src/+/1012788/

The PrefRegistry feature will be cleaned up separately, after
resolving the device_sync service and assistant service usage of
prefs.

Bug: 788918, 1012462
Change-Id: I9811c8f25530d9c0e949ae0675e51aeeb9f583c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845963
Commit-Queue: James Cook <jamescook@chromium.org>
Auto-Submit: James Cook <jamescook@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703915}