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This change implements automatic blocking of requests for the
"idle-detection" permission from incognito profiles in order to prevent
the feature from being used to correlate incognito and non-incognito
sessions.

As for requests for the "notifications" permission rather than simply
automatically denying the request (which would be an incognito oracle)
this patch waits a random amount of time before triggering the denial.
The code from the NotificationsPermissionContext is cleaned up and
reused for this.

Bug: 878979
Change-Id: I57c57f39457932f570d7094882dc00d9c0eafa16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360943
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807660}