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Currently we were displaying permission prompts in web kiosk mode for
origins of not the main app. To keep it consistent with other types of
kiosks, we should deny those requests.

We are not explicitly denying them, but leaving them unanswered, this
preventing them from being stored into prefs.

Bug: 1044551
Change-Id: Ic6f1a260d3f03b92fc52f8f341c6259155b791d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014403
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734443}