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This will allow us to query new records such as HTTPS.
More details of the experiment are available internally
at go/chrome-dns-concurrency.

Bug: 1134205
Change-Id: If849689da3086290a3b61e33f42631db16398bdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2636880Reviewed-by: Renjie Tang <renjietang@chromium.org>
Auto-Submit: David Schinazi <dschinazi@chromium.org>
Commit-Queue: David Schinazi <dschinazi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844955}