Effectively disable the predictor's DNS queue for an experiment

testing/variations/fieldtrial_testing_config_linux.json

 {
     "AsyncDNS": [
         {
             "group_name": "AsyncDNSA"
         }
     ],
     "AutofillClassifier": [
         {
             "group_name": "Enabled"
         }
@@ skipping 28 matching lines @@
         }
     ],
     "ChromotingQUIC": [
         {
             "group_name": "Enabled",
             "params": {
                 "delay_tcp_race": "true"
             }
         }
     ],
+    "DisablePredictorDNSQueue": [
+        {
+            "group_name": "Enabled"
+        }
+    ],
     "DocumentWriteEvaluator": [
         {
             "enable_features": [
                 "DocumentWriteEvaluator"
             ],
             "group_name": "Enabled"
         }
     ],
     "EnableGoogleCachedCopyTextExperiment": [
         {
@@ skipping 252 matching lines @@
     ],
     "use-new-media-cache": [
         {
             "enable_features": [
                 "use-new-media-cache"
             ],
             "group_name": "Enabled"
         }
     ]
 }