[Sync] Rewriting ".reset(new" pattern to use "= base::MakeUnique" instead.

components/sync/model_impl/model_type_store_impl.cc

 // Copyright 2015 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/model_impl/model_type_store_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 317 matching lines @@
   DCHECK(CalledOnValidThread());
   GetLeveldbWriteBatch(write_batch)->Delete(FormatMetadataKey(id));
 }
 
 void ModelTypeStoreImpl::DeleteGlobalMetadata(WriteBatch* write_batch) {
   DCHECK(CalledOnValidThread());
   GetLeveldbWriteBatch(write_batch)->Delete(kGlobalMetadataKey);
 }
 
 ModelTypeStoreImpl::WriteBatchImpl::WriteBatchImpl() {
-  leveldb_write_batch_.reset(new leveldb::WriteBatch());
+  leveldb_write_batch_ = base::MakeUnique<leveldb::WriteBatch>();
 }
 
 ModelTypeStoreImpl::WriteBatchImpl::~WriteBatchImpl() {}
 
 }  // namespace syncer