[sync] Purge directory data when migrating to USS

components/sync/engine_impl/model_type_registry.cc

Index: components/sync/engine_impl/model_type_registry.cc
diff --git a/components/sync/engine_impl/model_type_registry.cc b/components/sync/engine_impl/model_type_registry.cc
index bbdba9ea1b2a994221ea1658f699cf22e767850f..a122e1aab2b0eac60096d2f8619c7a84eb137614 100644
--- a/components/sync/engine_impl/model_type_registry.cc
+++ b/components/sync/engine_impl/model_type_registry.cc
@@ -127,8 +127,7 @@ void ModelTypeRegistry::ConnectNonBlockingType(
                                 MODEL_TYPE_COUNT);
       // If we succesfully migrated, purge the directory of data for the type.
       // Purging removes the directory's local copy of the data only.
-      directory()->PurgeEntriesWithTypeIn(ModelTypeSet(type), ModelTypeSet(),
-                                          ModelTypeSet());
+      directory()->PurgeEntriesWithTypeIn({type}, {}, {});
     } else {
       UMA_HISTOGRAM_ENUMERATION("Sync.USSMigrationFailure",
                                 ModelTypeToHistogramInt(type),