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

components/sync_driver/generic_change_processor_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/sync_driver/generic_change_processor.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 152 matching lines @@
     change_processor_.reset(new GenericChangeProcessor(
         type, &data_type_error_handler_,
         syncable_service_ptr_factory_.GetWeakPtr(),
         merge_result_ptr_factory_->GetWeakPtr(), test_user_share_->user_share(),
         &sync_factory, attachment_store->CreateAttachmentStoreForSync()));
     mock_attachment_service_ = sync_factory.GetMockAttachmentService();
   }
 
   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));
     }
   }
 
   GenericChangeProcessor* change_processor() {
     return change_processor_.get();
   }
 
   syncer::UserShare* user_share() {
     return test_user_share_->user_share();
   }
@@ skipping 322 matching lines @@
   syncer::SyncDataList sync_data =
       change_processor()->GetAllSyncData(syncer::SESSIONS);
   ASSERT_EQ(sync_data.size(), 1U);
   ASSERT_EQ("session tag 2",
             sync_data[0].GetSpecifics().session().session_tag());
 }
 
 }  // namespace
 
 }  // namespace sync_driver