Make UMA_HISTOGRAM_ENUMERATION work with scoped enums.

components/user_prefs/tracked/tracked_preference_helper.cc

Index: components/user_prefs/tracked/tracked_preference_helper.cc
diff --git a/components/user_prefs/tracked/tracked_preference_helper.cc b/components/user_prefs/tracked/tracked_preference_helper.cc
index b0415c46ffa7028e4e49b8e7ff7bd8bcf3591511..fce26b931d3e716e137ffdce1bfd1830a4a02cc7 100644
--- a/components/user_prefs/tracked/tracked_preference_helper.cc
+++ b/components/user_prefs/tracked/tracked_preference_helper.cc
@@ -111,13 +111,14 @@ void TrackedPreferenceHelper::ReportAction(ResetAction reset_action) const {
       // No report for DONT_RESET.
       break;
     case WANTED_RESET:
-      UMA_HISTOGRAM_ENUMERATION(
+      UMA_HISTOGRAM_EXACT_LINEAR(
           user_prefs::tracked::kTrackedPrefHistogramWantedReset, reporting_id_,
           reporting_ids_count_);
       break;
     case DO_RESET:
-      UMA_HISTOGRAM_ENUMERATION(user_prefs::tracked::kTrackedPrefHistogramReset,
-                                reporting_id_, reporting_ids_count_);
+      UMA_HISTOGRAM_EXACT_LINEAR(
+          user_prefs::tracked::kTrackedPrefHistogramReset, reporting_id_,
+          reporting_ids_count_);
       break;
   }
 }