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The only two consumers currently just pass in a key created using the
default contructor.  I'll hook up reasonable values to PreconnectManager
in followup CLs.

Bug: 966896
Change-Id: Ic4c69dea4a97795e41d6dcd90b85b531eadbbf1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1670529
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Shivani Sharma <shivanisha@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671945}