physicalweb: Remove vestiges of the Physical Web

This change removes all code related to the Physical Web.

BUG=826540

Change-Id: Ifda5d80c5cebeedf2e2fdf48142e6dd6c1ef73b6
Reviewed-on: https://chromium-review.googlesource.com/1054335
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Commit-Queue: Conley Owens <cco3@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559187}
10 files changed