Update NetworkTimeQueries field trial config

components/network_time/network_time_test_utils.h

Index: components/network_time/network_time_test_utils.h
diff --git a/components/network_time/network_time_test_utils.h b/components/network_time/network_time_test_utils.h
index 51b3c4f7c63657133754322d189d3644106ece4a..e9dd537606661c3f658b29a61361e1f57a8ab2d7 100644
--- a/components/network_time/network_time_test_utils.h
+++ b/components/network_time/network_time_test_utils.h
@@ -50,26 +50,18 @@ extern const double kGoodTimeResponseHandlerJsTime;
 std::unique_ptr<net::test_server::HttpResponse> GoodTimeResponseHandler(
     const net::test_server::HttpRequest& request);
 
-// Allows tests to configure the network time queries field trial.
+// Allows unit tests to configure the network time queries field trial.
 class FieldTrialTest {
  public:
+  FieldTrialTest();
   virtual ~FieldTrialTest();
 
-  // A FieldTrialList exists as a global singleton. Use
-  // CreateForUnitTest() in unit tests to create a FieldTrialTest that
-  // creates its own FieldTrialList; use CreateForBrowserTest() to use
-  // the singleton FieldTrialList that is created during browser setup.
-  static FieldTrialTest* CreateForUnitTest();
-  static FieldTrialTest* CreateForBrowserTest();
-
   void SetNetworkQueriesWithVariationsService(
       bool enable,
       float query_probability,
       NetworkTimeTracker::FetchBehavior fetch_behavior);
 
  private:
-  FieldTrialTest();
-  bool create_field_trial_list_ = true;
   std::unique_ptr<base::FieldTrialList> field_trial_list_;
   std::unique_ptr<base::test::ScopedFeatureList> scoped_feature_list_;