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Previously, having the caBLE transport in the list of transports was
special and indicated that a caBLE discovery should be created. Also,
unlike all over discoveries, the caBLE discovery was created in the
GetAssertion request handler, not the base class.

This change makes the caBLE transport no longer special because, in the
future, we'll want to create a caBLE discovery without the extension. It
also regularises the handling of the caBLE transport to match all other
transports. As a consequence, the caBLE discovery data becomes the
property of the FidoDiscoveryFactory and two tests become inapplicable
at the level at which they were being tested.

Change-Id: Ibcd758fa9304a7cb8a868b1bcf2c692c15f72221
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1756951
Auto-Submit: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Commit-Queue: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691798}