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 eb6b4fce2cc0a80a2f0b4e0dcc4a399e877135d6..7ec1fea87c10e5a85556614f333c9b4c0ba15e5e 100644
--- a/chrome/browser/prefs/chrome_pref_service_factory.h
+++ b/chrome/browser/prefs/chrome_pref_service_factory.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_PREFS_CHROME_PREF_SERVICE_FACTORY_H_
 
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 
 namespace base {
 class FilePath;
@@ -21,6 +22,7 @@ class PrefRegistrySyncable;
 }
 
 class ManagedUserSettingsService;
+class PrefHashStore;
 class PrefRegistry;
 class PrefService;
 class PrefServiceSyncable;
@@ -55,6 +57,7 @@ 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);