Infra: Disable Chromium CQ until outage is over.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=716089
TBR=dpranke@chromium.org,andybons@chromium.org

Review-Url: https://codereview.chromium.org/2847903002 .
Cr-Commit-Position: refs/heads/master@{#467799}

infra/config/cq.cfg

@@ -3,6 +3,7 @@
 
 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