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This helps with reasoning from the logs whether an outstanding CTAP2
request was cancelled, e.g. by sending CTAPHID_CANCEL.

Change-Id: I3c93cbd399a074f03821cebcfa2825b6d96b3f2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949037
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Commit-Queue: Adam Langley <agl@chromium.org>
Auto-Submit: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721150}