cq.cfg: switch to luci builders

R=estaab@chromium.org
BUG=629676

Review-Url: https://codereview.chromium.org/2184253003

infra/config/cq.cfg

@@ -19,17 +19,9 @@ verifiers {
 
   try_job {
     buckets {
-      name: "master.tryserver.infra"
+      name: "luci.infra.try"
-      builders {
+      builders { name: "Depot Tools Presubmit" }
-        name: "Depot Tools Presubmit"
+      builders { name: "Recipe Roll Downstream Tester" }
-      }
-      builders {
-        name: "Depot Tools Presubmit (Swarming)"
-        experiment_percentage: 100
-      }
-      builders {
-        name: "Recipe Roll Downstream Tester"
-      }
     }
   }
 }