Make UMA_HISTOGRAM_ENUMERATION work with scoped enums.

components/user_prefs/tracked/tracked_preference_helper.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/user_prefs/tracked/tracked_preference_helper.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_macros.h"
 #include "components/user_prefs/tracked/tracked_preference_histogram_names.h"
@@ skipping 93 matching lines @@
       base::HistogramBase::kUmaTargetedHistogramFlag);
   histogram->Add(reporting_id_);
 }
 
 void TrackedPreferenceHelper::ReportAction(ResetAction reset_action) const {
   switch (reset_action) {
     case DONT_RESET:
       // 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;
   }
 }
 
 void TrackedPreferenceHelper::ReportSplitPreferenceChangedCount(
     size_t count) const {
   // The histogram below is an expansion of the UMA_HISTOGRAM_COUNTS_100 macro
   // adapted to allow for a dynamically suffixed histogram name.
   // Note: The factory creates and owns the histogram.
   base::HistogramBase* histogram = base::LinearHistogram::FactoryGet(
       user_prefs::tracked::kTrackedSplitPrefHistogramChanged + pref_path_, 1,
       100,  // Allow counts up to 100.
       101, base::HistogramBase::kUmaTargetedHistogramFlag);
   histogram->Add(count);
 }