[Sync] Rely on directory to decide which types need to be purged

sync/test/engine/test_syncable_utils.h

 // Copyright (c) 2012 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.
 //
 // Utilities that are useful in verifying the state of items in a
 // syncable database.
 
 #ifndef SYNC_TEST_ENGINE_TEST_SYNCABLE_UTILS_H_
 #define SYNC_TEST_ENGINE_TEST_SYNCABLE_UTILS_H_
 
 #include <string>
 
 #include "sync/internal_api/public/base/model_type.h"
+#include "sync/protocol/sync.pb.h"
 
 namespace syncer {
 namespace syncable {
 
 class BaseTransaction;
 class Directory;
 class Id;
 class WriteTransaction;
 
 // Count the number of entries with a given name inside of a parent.
@@ skipping 11 matching lines @@
 // Assert that there's only one entry by this name in this parent.
 // Return the Id.
 Id GetOnlyEntryWithName(BaseTransaction* rtrans,
                         const syncable::Id& parent_id,
                         const std::string& name);
 
 void CreateTypeRoot(WriteTransaction* trans,
                     syncable::Directory *dir,
                     ModelType type);
 
+sync_pb::DataTypeProgressMarker BuildProgress(ModelType type);
+
 }  // namespace syncable
 }  // namespace syncer
 
 #endif  // SYNC_TEST_ENGINE_TEST_SYNCABLE_UTILS_H_