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This change guarantees the USB printer config and the print job
notfications only use the OffTheRecord(OTR) profile to open System Web
Apps(SWA) in Guest mode. There is an existing check
(https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/ui/browser.cc;l=471)
that only OTR guest profiles are allowed to open SWAs.

Change-Id: I78aef11b2d2cb8377f17ecd90f494828119ddf1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372909Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801834}