Gather stability prefs into managing objects.

components/metrics/metrics_service.h

Index: components/metrics/metrics_service.h
diff --git a/components/metrics/metrics_service.h b/components/metrics/metrics_service.h
index 46b6d9f3a9bd70a8facb3ad70b7bae50e8a3d849..b32948c0c87838e6884f9a62c4a8c96216596c05 100644
--- a/components/metrics/metrics_service.h
+++ b/components/metrics/metrics_service.h
@@ -336,9 +336,6 @@ class MetricsService : public base::HistogramFlattener {
   // Called after transmission completes (either successfully or with failure).
   void OnLogUploadComplete(int response_code);
 
-  // Reads, increments and then sets the specified integer preference.
-  void IncrementPrefValue(const char* path);
-
   // Reads, increments and then sets the specified long preference that is
   // stored as a string.
   void IncrementLongPrefsValue(const char* path);