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A FidoRequestHandler currently reports a FidoTransportProtocol to its
Observer (i.e. the UI layer) as available, even if the FidoDiscovery for
that transport invoked DiscoveryStated() with success=false. It seems
logical in this case to act as if the discovery never had been
instantiated in the first place.

Change-Id: I50c2832f3b5bc321f2b9454e90770204c229b311
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087955
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748874}