Revert of Enable DRP config service by default

testing/variations/fieldtrial_testing_config_chromeos.json

 {
     "AutofillClassifier": [
         {
             "group_name": "Enabled"
         }
     ],
     "AutofillFieldMetadata": [
         {
             "group_name": "Enabled"
         }
@@ skipping 20 matching lines @@
         },
         {
             "group_name": "Default"
         }
     ],
     "ChromotingQUIC": [
         {
             "group_name": "Enabled"
         }
     ],
+    "DataReductionProxyConfigService": [
+        {
+            "group_name": "Enabled",
+            "params": {
+                "minimum_refresh_interval_on_success_msec": "21600000"
+            }
+        }
+    ],
     "EnableGoogleCachedCopyTextExperiment": [
         {
             "group_name": "Button"
         }
     ],
     "ExtensionActionRedesign": [
         {
             "group_name": "Enabled"
         }
     ],
@@ skipping 137 matching lines @@
     ],
     "use-new-media-cache": [
         {
             "enable_features": [
                 "use-new-media-cache"
             ],
             "group_name": "Enabled"
         }
     ]
 }