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This patch provides UI controls for the new WebUSB guard permission in
the page info popup and on the site settings pages.

Screenshots of the new UI are included in the design doc:
https://goo.gl/uMPMZZ

Bug: 771703
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I4c9dc2cc59a589e558ceb346982d493ac66dc674
Reviewed-on: https://chromium-review.googlesource.com/982595Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548866}