Add back a check for improper usage of IsOneTimeRandomizationEnabled.

base/metrics/field_trial.h

Index: base/metrics/field_trial.h
diff --git a/base/metrics/field_trial.h b/base/metrics/field_trial.h
index 4e89ccf693806a99e1acdbbfc4c4f6bf292eefba..3b831d8fc4d72c03b972ae3c1227e8e9ab6dc64f 100644
--- a/base/metrics/field_trial.h
+++ b/base/metrics/field_trial.h
@@ -364,10 +364,11 @@ class BASE_API FieldTrialList {
 
   static FieldTrialList* global_;  // The singleton of this class.
 
-  // This will tell us if there is an attempt to register a field trial without
-  // creating the FieldTrialList. This is not an error, unless a FieldTrialList
-  // is created after that.
-  static bool register_without_global_;
+  // This will tell us if there is an attempt to register a field
+  // trial or check if one-time randomization is enabled without
+  // creating the FieldTrialList. This is not an error, unless a
+  // FieldTrialList is created after that.
+  static bool used_without_global_;
 
   // A helper value made available to users, that shows when the FieldTrialList
   // was initialized.  Note that this is a singleton instance, and hence is a