Make UMA_HISTOGRAM_ENUMERATION work with scoped enums.

components/content_settings/core/browser/host_content_settings_map.cc

 // Copyright (c) 2012 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/content_settings/core/browser/host_content_settings_map.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 593 matching lines @@
       UMA_HISTOGRAM_ENUMERATION("ContentSettings.ExceptionScheme", scheme,
                                 ContentSettingsPattern::SCHEME_MAX);
 
       if (scheme == ContentSettingsPattern::SCHEME_FILE) {
         UMA_HISTOGRAM_BOOLEAN("ContentSettings.ExceptionSchemeFile.HasPath",
                               setting_entry.primary_pattern.HasPath());
         size_t num_values;
         int histogram_value =
             ContentSettingTypeToHistogramValue(content_type, &num_values);
         if (setting_entry.primary_pattern.HasPath()) {
-          UMA_HISTOGRAM_ENUMERATION(
+          UMA_HISTOGRAM_EXACT_LINEAR(
               "ContentSettings.ExceptionSchemeFile.Type.WithPath",
               histogram_value, num_values);
         } else {
-          UMA_HISTOGRAM_ENUMERATION(
+          UMA_HISTOGRAM_EXACT_LINEAR(
               "ContentSettings.ExceptionSchemeFile.Type.WithoutPath",
               histogram_value, num_values);
         }
       }
 
       if (setting_entry.source == "preference")
         ++num_exceptions;
     }
 
     std::string histogram_name =
@@ skipping 285 matching lines @@
         if (primary_pattern)
           *primary_pattern = rule.primary_pattern;
         if (secondary_pattern)
           *secondary_pattern = rule.secondary_pattern;
         return base::WrapUnique(rule.value.get()->DeepCopy());
       }
     }
   }
   return std::unique_ptr<base::Value>();
 }