Tweak client-side default scheduler configs to match latest server configs.

testing/variations/fieldtrial_testing_config.json

 {
     "AlternateComponentUrls": [
         {
             "platforms": [
                 "android",
                 "chromeos",
                 "ios",
                 "linux",
                 "mac",
                 "win"
@@ skipping 345 matching lines @@
             "platforms": [
                 "android",
                 "chromeos",
                 "ios",
                 "linux",
                 "mac",
                 "win"
             ],
             "experiments": [
                 {
-                    "name": "Default",
+                    "//1": "Enable on-by-default redirections with default",
+                    "//2": "client-side init params (ref.",
+                    "//3": "GetDefaultTaskSchedulerInitParams() in",
+                    "//4": "browser_main_loop.cc).",
+                    "name": "RedirectWithDefaultInitParams",
                     "params": {
                         "RedirectSequencedWorkerPools": "true"
                     }
                 },
                 {
                     "name": "EnableViaFlag",
                     "forcing_flag": "enable-browser-task-scheduler",
                     "params": {
                         "RedirectHistoryService": "true",
                         "RedirectNonUINonIOBrowserThreads": "true",
@@ skipping 2972 matching lines @@
                 {
                     "name": "Enabled",
                     "enable_features": [
                         "use-new-media-cache"
                     ]
                 }
             ]
         }
     ]
 }