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Removes the spammy warning message, and replaces it with a sanity-
check that the queue has not grown past 10 seconds' worth of
packets.  If the sanity-check trips, a process crash dump will be
sent to make us aware, via crash reports, that this is a problem
in-the-wild.

Review URL: https://codereview.chromium.org/539323002

Cr-Commit-Position: refs/heads/master@{#294928}