Add metrics for schemes of content setting exceptions

components/content_settings/core/browser/host_content_settings_map.h

Index: components/content_settings/core/browser/host_content_settings_map.h
diff --git a/components/content_settings/core/browser/host_content_settings_map.h b/components/content_settings/core/browser/host_content_settings_map.h
index bb2230918c9f5c9f1357be2d894737a9f18b6d8e..13a9234a1318584615b3bf03cd104f8fa0fcc9b7 100644
--- a/components/content_settings/core/browser/host_content_settings_map.h
+++ b/components/content_settings/core/browser/host_content_settings_map.h
@@ -329,8 +329,8 @@ class HostContentSettingsMap : public content_settings::Observer,
   // leave in some code to remove old-format settings for a long time.
   void MigrateKeygenSettings();
 
-  // Collect UMA data about the number of exceptions.
-  void RecordNumberOfExceptions();
+  // Collect UMA data of exceptions.
+  void RecordExceptionMetrics();
 
   // Adds content settings for |content_type| and |resource_identifier|,
   // provided by |provider|, into |settings|. If |incognito| is true, adds only