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Adds a pref for Supervised Users to determine whether the user is
allowed to grant permissions to extensions (and, by extension, whether
the user is allowed to install extensions with parental approval).

The pref is controlled by Sync settings for the supervised user,
ultimately determined by the custodian checking the "Allow sites and
apps to ask for permissions" checkbox in the Chrome family dashboard.

For now, we will rely on the fact that this checkbox also sets the
GeolocationDisabled setting. In the future, the Kids Management server
should send a separate setting for extension permissions; that will give
us flexibility in the future to break the checkbox into multiple
settings.

Bug: 1018956
Change-Id: Ifda14018dc7f4a018b493159c6e80b00c2e18b7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885216Reviewed-by: Dan S <danan@chromium.org>
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Auto-Submit: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710991}