Sync: Don't set/use Parent ID for non-hierarchical sync data types.

sync/internal_api/sync_rollback_manager_unittest.cc

Index: sync/internal_api/sync_rollback_manager_unittest.cc
diff --git a/sync/internal_api/sync_rollback_manager_unittest.cc b/sync/internal_api/sync_rollback_manager_unittest.cc
index 0b5a6b658e36a3807749fd336a5a25445373b952..2cc0015b3d2029fb3e2eb39a1085af3094b6e667 100644
--- a/sync/internal_api/sync_rollback_manager_unittest.cc
+++ b/sync/internal_api/sync_rollback_manager_unittest.cc
@@ -92,12 +92,9 @@ class SyncRollbackManagerTest : public testing::Test,
   int64 CreateEntry(UserShare* user_share, ModelType type,
                     const std::string& client_tag) {
     WriteTransaction trans(FROM_HERE, user_share);
-    ReadNode type_root(&trans);
-    EXPECT_EQ(BaseNode::INIT_OK, type_root.InitTypeRoot(type));
-
     WriteNode node(&trans);
     EXPECT_EQ(WriteNode::INIT_SUCCESS,
-              node.InitUniqueByCreation(type, type_root, client_tag));
+              node.InitUniqueByCreation(type, client_tag));
     return node.GetEntry()->GetMetahandle();
   }