Change configuration of user prefs to use mojo.

components/sync_preferences/pref_service_syncable_factory.cc

Index: components/sync_preferences/pref_service_syncable_factory.cc
diff --git a/components/sync_preferences/pref_service_syncable_factory.cc b/components/sync_preferences/pref_service_syncable_factory.cc
index 2d314f51952cde9f54c97017448e7d945acd0e52..38fb868b93274e407c0e98a824cfa98016456049 100644
--- a/components/sync_preferences/pref_service_syncable_factory.cc
+++ b/components/sync_preferences/pref_service_syncable_factory.cc
@@ -11,6 +11,7 @@
 #include "components/prefs/pref_notifier_impl.h"
 #include "components/prefs/pref_value_store.h"
 #include "components/sync_preferences/pref_service_syncable.h"
+#include "services/preferences/public/cpp/persistent_pref_store_mojo.h"
 
 #if !defined(OS_IOS)
 #include "components/policy/core/browser/browser_policy_connector.h"
@@ -53,8 +54,12 @@ void PrefServiceSyncableFactory::SetPrefModelAssociatorClient(
 }
 
 std::unique_ptr<PrefServiceSyncable> PrefServiceSyncableFactory::CreateSyncable(
-    user_prefs::PrefRegistrySyncable* pref_registry) {
+    user_prefs::PrefRegistrySyncable* pref_registry,
+    prefs::mojom::PersistentPrefStoreConnectorPtr connector) {
   TRACE_EVENT0("browser", "PrefServiceSyncableFactory::CreateSyncable");
+  DCHECK(!connector || !user_prefs_);
+  if (connector)
+    user_prefs_ = new prefs::PersistentPrefStoreMojo(std::move(connector));
   PrefNotifierImpl* pref_notifier = new PrefNotifierImpl();
   std::unique_ptr<PrefServiceSyncable> pref_service(new PrefServiceSyncable(
       pref_notifier,