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In order to make things more easily extendable in the future, make the
contents of the caBLEv2 QR codes be a CBOR map. This should eliminate
the need to version-switch based on a URL prefix, so drop the "/c1/"
from the URL.

BUG=1002262

Change-Id: Id05a38c8ba510f673594774e57d418f8259779f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444174
Commit-Queue: Adam Langley <agl@chromium.org>
Auto-Submit: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#813897}