Make testing/testing_support upload reviews to Gerrit by default

BUG=634946

Change-Id: I9414fc98b0a9b50bcbed8c28a3854bf349115485
Reviewed-on: https://chromium-review.googlesource.com/410039
Reviewed-by: Andrew Bonventre <andybons@chromium.org>

codereview.settings

diff --git a/codereview.settings b/codereview.settings
index 3581c3f..31dd514 100644
--- a/codereview.settings
+++ b/codereview.settings
@@ -1,5 +1,5 @@
-# This file is used by gcl to get repository specific information.
-CODE_REVIEW_SERVER: https://codereview.chromium.org
-VIEW_VC: https://chromium.googlesource.com/infra/testing/testing_support/+/
+# This file is used by git cl to get repository specific information.
 CC_LIST: chromium-reviews@chromium.org
-PROJECT: infra/testing/testing_support
+CODE_REVIEW_SERVER: https://codereview.chromium.org
+GERRIT_HOST: True
+VIEW_VC: https://chromium.googlesource.com/infra/testing/testing_support/+/