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This is relatively harmless, but can hit a NOTREACHED. This change makes
the CTAP2 parsers follow the stricter, IsStringUTF8, result.

Bug: 955317
Change-Id: If7f8b8a0c1e85566bb035b21626d52fd91038a42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1576337
Commit-Queue: Adam Langley <agl@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Auto-Submit: Adam Langley <agl@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653214}