Fix a race condition in preference metric reporting.

chrome/browser/prefs/chrome_pref_service_factory.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PREFS_CHROME_PREF_SERVICE_FACTORY_H_
 #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;
 class SequencedTaskRunner;
 }
 
 namespace policy {
 class PolicyService;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 class ManagedUserSettingsService;
+class PrefHashStore;
 class PrefRegistry;
 class PrefService;
 class PrefServiceSyncable;
 class PrefStore;
 
 namespace chrome_prefs {
 
 // Factory methods that create and initialize a new instance of a
 // PrefService for Chrome with the applicable PrefStores. The
 // |pref_filename| points to the user preference file. This is the
@@ skipping 14 matching lines @@
     base::SequencedTaskRunner* pref_io_task_runner,
     policy::PolicyService* policy_service,
     const scoped_refptr<PrefRegistry>& pref_registry,
     bool async);
 
 PrefServiceSyncable* CreateProfilePrefs(
     const base::FilePath& pref_filename,
     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);
 
 }  // namespace chrome_prefs
 
 #endif  // CHROME_BROWSER_PREFS_CHROME_PREF_SERVICE_FACTORY_H_