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In current implementation, we auto-select transport type to previously
used transport type. Disable this feature for MakeCredential request.

Bug: 868212
Change-Id: I4b0c3e642df1eaffa8f76956223a6a7f9b66a21b
Reviewed-on: https://chromium-review.googlesource.com/1182101
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584658}