[tricium] Enable Gerrit reporting for chromium/src

Bug: 871456
Change-Id: Id3a70ac107c7a06a210a7bc90392a63f557c0d8c
Reviewed-on: https://chromium-review.googlesource.com/1164254Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581251}

infra/config/global/tricium-prod.cfg

@@ -22,7 +22,6 @@ repos {
     project: "chromium/src"
     git_url: "https://chromium.googlesource.com/chromium/src"
   }
-  disable_reporting: true
 }
 
 service_account: "tricium-prod@appspot.gserviceaccount.com"