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Awhile back, we added logic to withhold all-hosts style permissions via
sync if the user had withheld hosts on any machine. This was a mistake,
since it resulted in the user being affected by an experiment across
all machines, even if they only opted into the experiment on one.

Remove the all_urls_enabled bit on the ExtensionSpecifics proto. A
replacement will be added in a subsequent patch. We can't just re-use
the existing one, because we need to prevent older machines from
seeing the preference and automatically applying experimental behavior.

Bug: 839681
Change-Id: I735b7005ca76b9abe3b61709083bb4f552d0a47f
Reviewed-on: https://chromium-review.googlesource.com/1047850
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557548}