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 271 matching lines @@
         }
     ],
     "TokenBinding": [
         {
             "enable_features": [
                 "token-binding"
             ],
             "group_name": "TokenBinding"
         }
     ],
+    "UsePredictorDNSQueue": [
+        {
+            "group_name": "Disabled"
+        }
+    ],
     "V8CacheStrategiesForCacheStorage": [
         {
             "group_name": "none"
         },
         {
             "group_name": "normal"
         },
         {
             "group_name": "aggressive"
         }
@@ skipping 31 matching lines @@
     ],
     "use-new-media-cache": [
         {
             "enable_features": [
                 "use-new-media-cache"
             ],
             "group_name": "Enabled"
         }
     ]
 }