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We have now qualified our first dogfood release, so it's safe to enable
dogfood releases by default.

Bug: 1164154
Change-Id: I248bb8f5d2ea6dce1e2754a959b421cb1704d879
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618365
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841668}