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

sync/internal_api/sync_backup_manager_unittest.cc

Index: sync/internal_api/sync_backup_manager_unittest.cc
diff --git a/sync/internal_api/sync_backup_manager_unittest.cc b/sync/internal_api/sync_backup_manager_unittest.cc
index 2bf778ee187d693dd4be8f73c5d550daaced0c2f..6dd20db0ae40cd2d3e325fc716fa091fca0a24c8 100644
--- a/sync/internal_api/sync_backup_manager_unittest.cc
+++ b/sync/internal_api/sync_backup_manager_unittest.cc
@@ -78,12 +78,10 @@ class SyncBackupManagerTest : public syncer::SyncManager::Observer,
   void 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));
   }
 
   void ConfigureSyncer() {