[webauthn] new commits pushed by agl

The following commits were just pushed by agl to https://github.com/w3c/webauthn:

* Have the authenticator output a bytestring, not a map.

The platform generally echos the authenticator extension outputs in its
own extension output and DPK does the same. In order to avoid either
replicating the DPK output structure into IDL, or having the platforms
re-encode it, have the authenticators produce a byte string containing
the encoded map. The platform can then copy the byte string verbatim.
  by Adam Langley
https://github.com/w3c/webauthn/commit/ec03d4da8d88cd797a3c003c0212cc1beb438f4e



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