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

components/sync_driver/generic_change_processor_unittest.cc

Index: components/sync_driver/generic_change_processor_unittest.cc
diff --git a/components/sync_driver/generic_change_processor_unittest.cc b/components/sync_driver/generic_change_processor_unittest.cc
index f7ed4321ee5a199411751c39eb2e9b3770ac3dda..ee1f5bc15f495d202888d6b395523d93d8541d3d 100644
--- a/components/sync_driver/generic_change_processor_unittest.cc
+++ b/components/sync_driver/generic_change_processor_unittest.cc
@@ -170,11 +170,9 @@ class SyncGenericChangeProcessorTest : public testing::Test {
 
   void BuildChildNodes(syncer::ModelType type, int n) {
     syncer::WriteTransaction trans(FROM_HERE, user_share());
-    syncer::ReadNode root(&trans);
-    ASSERT_EQ(syncer::BaseNode::INIT_OK, root.InitTypeRoot(type));
     for (int i = 0; i < n; ++i) {
       syncer::WriteNode node(&trans);
-      node.InitUniqueByCreation(type, root, base::StringPrintf("node%05d", i));
+      node.InitUniqueByCreation(type, base::StringPrintf("node%05d", i));
     }
   }