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Seems like we're going to want to make this more generic to cope with
PIN support.

Change-Id: I230f317e364a8072b02ffe577b33232c5b9b9786
Reviewed-on: https://chromium-review.googlesource.com/c/1475008
Auto-Submit: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632810}