Gather stability prefs into managing objects.

components/metrics/metrics_log.h

Index: components/metrics/metrics_log.h
diff --git a/components/metrics/metrics_log.h b/components/metrics/metrics_log.h
index fb4bef2b9d7dcafe61dce481adb60c6f58c1b9e5..27b07a68a0dca9c66349d6c6499ba6fc378247da 100644
--- a/components/metrics/metrics_log.h
+++ b/components/metrics/metrics_log.h
@@ -18,7 +18,6 @@
 #include "components/metrics/metrics_service_client.h"
 #include "components/metrics/proto/chrome_user_metrics_extension.pb.h"
 
-class PrefRegistrySimple;
 class PrefService;
 
 namespace base {
@@ -56,9 +55,6 @@ class MetricsLog {
              PrefService* local_state);
   virtual ~MetricsLog();
 
-  // Registers local state prefs used by this class.
-  static void RegisterPrefs(PrefRegistrySimple* registry);
-
   // Computes the MD5 hash of the given string, and returns the first 8 bytes of
   // the hash.
   static uint64_t Hash(const std::string& value);
@@ -172,15 +168,11 @@ class MetricsLog {
   // call to RecordStabilityMetrics().
   bool HasStabilityMetrics() const;
 
-  // Within the stability group, write required attributes.
-  void WriteRequiredStabilityAttributes(PrefService* pref);
-
   // Within the stability group, write attributes that need to be updated asap
   // and can't be delayed until the user decides to restart chromium.
   // Delaying these stats would bias metrics away from happy long lived
   // chromium processes (ones that don't crash, and keep on running).
-  void WriteRealtimeStabilityAttributes(PrefService* pref,
-                                        base::TimeDelta incremental_uptime,
+  void WriteRealtimeStabilityAttributes(base::TimeDelta incremental_uptime,
                                         base::TimeDelta uptime);
 
   // closed_ is true when record has been packed up for sending, and should