make swarming trybuilders non-experimental

infra/config/cq.cfg

 # See http://luci-config.appspot.com/schemas/projects/refs:cq.cfg for the
 # documentation of this file format.
 
 version: 1
 cq_name: "luci-gae"
 git_repo_url: "https://github.com/luci/gae.git"
 cq_status_url: "https://chromium-cq-status.appspot.com"
 rietveld {
   url: "https://codereview.chromium.org"
 }
 verifiers {
   reviewer_lgtm {
      committer_list: "project-infra-committers"
   }
   try_job {
     buckets {
       name: "master.tryserver.infra"
       builders { name: "Luci-GAE Linux Trusty 64 Tester" }
+      builders { name: "Luci-GAE Linux Trusty 64 Tester (Swarming)" }
       builders { name: "Luci-GAE Presubmit" }
-
-      builders {
-        name: "Luci-GAE Linux Trusty 64 Tester (Swarming)"
-        experiment_percentage: 100
-      }
-      builders {
-        name: "Luci-GAE Presubmit (Swarming)"
-        experiment_percentage: 100
-      }
+      builders { name: "Luci-GAE Presubmit (Swarming)" }
     }
   }
 }