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This patch addes UI flag that enables by default support of CTAP2
security keys.

Bug: 780078
Change-Id: Ib182644ddf98ebc80e7ffe9fb4bc66c76c44a98b
Reviewed-on: https://chromium-review.googlesource.com/1101900
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567792}