[sync] Purge directory data when migrating to USS

components/sync/syncable/model_type_unittest.cc

Index: components/sync/syncable/model_type_unittest.cc
diff --git a/components/sync/syncable/model_type_unittest.cc b/components/sync/syncable/model_type_unittest.cc
index 701f4d3e19c19ae7376055970a370dfb78802cc1..f358a0183c3eb724ed815e27541e2e7e3857ffcb 100644
--- a/components/sync/syncable/model_type_unittest.cc
+++ b/components/sync/syncable/model_type_unittest.cc
@@ -37,7 +37,7 @@ TEST_F(ModelTypeTest, ModelTypeFromValue) {
 }
 
 TEST_F(ModelTypeTest, ModelTypeSetToValue) {
-  const ModelTypeSet model_types(BOOKMARKS, APPS);
+  const ModelTypeSet model_types({BOOKMARKS, APPS});
 
   std::unique_ptr<base::ListValue> value(ModelTypeSetToValue(model_types));
   EXPECT_EQ(2u, value->GetSize());
@@ -114,8 +114,8 @@ TEST_F(ModelTypeTest, ModelTypeHistogramMapping) {
 
 TEST_F(ModelTypeTest, ModelTypeSetFromString) {
   ModelTypeSet empty;
-  ModelTypeSet one(BOOKMARKS);
-  ModelTypeSet two(BOOKMARKS, TYPED_URLS);
+  ModelTypeSet one({BOOKMARKS});
+  ModelTypeSet two({BOOKMARKS, TYPED_URLS});
 
   EXPECT_EQ(empty, ModelTypeSetFromString(ModelTypeSetToString(empty)));
   EXPECT_EQ(one, ModelTypeSetFromString(ModelTypeSetToString(one)));