Turn Chromium CQ back on now that the outage is hopefully fixed.

TBR=tandrii@chromium.org
BUG=716089

Review-Url: https://codereview.chromium.org/2848653004 .
Cr-Commit-Position: refs/heads/master@{#467800}

infra/config/cq.cfg

@@ -3,7 +3,6 @@
 
 version: 1
 cq_name: "chromium"
-in_production: false
 cq_status_url: "https://chromium-cq-status.appspot.com"
 git_repo_url: "https://chromium.googlesource.com/chromium/src"
 commit_burst_delay: 60