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The pref is registered with profile prefs.

Also change the enterprise_reporting::RegisterPrefs to
enterprise_reporting::RegisterLocalStatePrefs.

Bug: 1006899
Change-Id: I8334229e585f088f0a5da8bd8d0545c5c9078ed2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854467Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706166}