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Previously, SupervisedUserService explicitly called
SetEncryptEverythingAllowed, requiring a dependency to SyncService.
Now, the "EncryptEverythingAllowed" bit is instead propagated via
SyncTypePreferenceProvider, which SupervisedUserService already
implements.

After this, there is only one remaining dependency from
SupervisedUserService to SyncService, namely adding/removing itself
as a PreferenceProvider. That will be cleaned up in a followup by
wiring it through the factories instead.

Bug: 946473
Change-Id: I797abf14bc03aacf2e130a283f3a12c88a2cd358
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1541183
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644814}