Pref service: enable for user prefs in chrome behind a flag.

chrome/browser/prefs/chrome_pref_service_factory.cc

Index: chrome/browser/prefs/chrome_pref_service_factory.cc
diff --git a/chrome/browser/prefs/chrome_pref_service_factory.cc b/chrome/browser/prefs/chrome_pref_service_factory.cc
index 560c3535166c3b0067d62e584c5522c8afb2d004..28f35b27669a2316330b06b90a31b9a887a1cf17 100644
--- a/chrome/browser/prefs/chrome_pref_service_factory.cc
+++ b/chrome/browser/prefs/chrome_pref_service_factory.cc
@@ -457,7 +457,8 @@ std::unique_ptr<PrefService> CreateLocalState(
 std::unique_ptr<sync_preferences::PrefServiceSyncable> CreateProfilePrefs(
     const base::FilePath& profile_path,
     base::SequencedTaskRunner* pref_io_task_runner,
-    prefs::mojom::TrackedPreferenceValidationDelegate* validation_delegate,
+    std::unique_ptr<prefs::mojom::TrackedPreferenceValidationDelegate>*
+        validation_delegate,
     policy::PolicyService* policy_service,
     SupervisedUserSettingsService* supervised_user_settings,
     const scoped_refptr<PrefStore>& extension_prefs,
@@ -482,7 +483,7 @@ std::unique_ptr<sync_preferences::PrefServiceSyncable> CreateProfilePrefs(
       CreateProfilePrefStoreManager(profile_path)
           ->CreateProfilePrefStore(pref_io_task_runner,
                                    start_sync_flare_for_prefs,
-                                   validation_delegate));
+                                   validation_delegate, connector));
   PrepareFactory(&factory, profile_path, policy_service,
                  supervised_user_settings, user_pref_store, extension_prefs,
                  async);