Fix a race condition in preference metric reporting.

chrome/browser/prefs/chrome_pref_service_factory.h

Index: chrome/browser/prefs/chrome_pref_service_factory.h
diff --git a/chrome/browser/prefs/chrome_pref_service_factory.h b/chrome/browser/prefs/chrome_pref_service_factory.h
index b1322b768e29e33a7bb6bd5defc7ac2298b30907..3456463fc6759cd08729b58969338a0f5a0c9843 100644
--- a/chrome/browser/prefs/chrome_pref_service_factory.h
+++ b/chrome/browser/prefs/chrome_pref_service_factory.h
@@ -22,6 +22,7 @@ class PrefRegistrySyncable;
 }
 
 class ManagedUserSettingsService;
+class PrefHashStore;
 class PrefRegistry;
 class PrefService;
 class PrefServiceSyncable;
@@ -56,6 +57,7 @@ scoped_ptr<PrefServiceSyncable> CreateProfilePrefs(
     base::SequencedTaskRunner* pref_io_task_runner,
     policy::PolicyService* policy_service,
     ManagedUserSettingsService* managed_user_settings,
+    scoped_ptr<PrefHashStore> pref_hash_store,
     const scoped_refptr<PrefStore>& extension_prefs,
     const scoped_refptr<user_prefs::PrefRegistrySyncable>& pref_registry,
     bool async);