[Sync] Refactor sync configuration logic.

chrome/browser/sync/glue/data_type_manager_impl_unittest.cc

Index: chrome/browser/sync/glue/data_type_manager_impl_unittest.cc
diff --git a/chrome/browser/sync/glue/data_type_manager_impl_unittest.cc b/chrome/browser/sync/glue/data_type_manager_impl_unittest.cc
index c344d48190f300a04d94635b5eb011d985be10af..37f1e8f3bb445e94d6fea303707aa04fddc4cac0 100644
--- a/chrome/browser/sync/glue/data_type_manager_impl_unittest.cc
+++ b/chrome/browser/sync/glue/data_type_manager_impl_unittest.cc
@@ -41,12 +41,12 @@ class FakeBackendDataTypeConfigurer : public BackendDataTypeConfigurer {
   virtual ~FakeBackendDataTypeConfigurer() {}
 
   virtual void ConfigureDataTypes(
-      sync_api::ConfigureReason reason,
-      ModelTypeSet types_to_add,
-      ModelTypeSet types_to_remove,
+      const sync_api::ConfigureReason& reason,
+      const ModelTypeSet& types_to_add,
+      const ModelTypeSet& types_to_remove,
       NigoriState nigori_state,
-      base::Callback<void(ModelTypeSet)> ready_task,
-      base::Callback<void()> retry_callback) OVERRIDE {
+      const base::Callback<void(ModelTypeSet)>& ready_task,
+      const base::Callback<void()>& retry_callback) OVERRIDE {
     last_nigori_state_ = nigori_state;
     last_ready_task_ = ready_task;
   }