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I thought that this would trigger a hairpin callback, but it doesn't
because device discovery goes via the MessageLoop in both the virtual
and real-world cases.

Change-Id: I2c44793294189d9171221d1cb9cdb5a706c3869e
Reviewed-on: https://chromium-review.googlesource.com/982634
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548499}