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

components/sync/model_impl/model_type_store_backend_unittest.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_backend.h"
 
 #include <utility>
 
+#include "base/memory/ptr_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/leveldatabase/src/include/leveldb/env.h"
 #include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
 
 namespace syncer {
 
 class ModelTypeStoreBackendTest : public testing::Test {
  public:
   scoped_refptr<ModelTypeStoreBackend> GetOrCreateBackend() {
     std::string path = "/test_db";
@@ skipping 98 matching lines @@
   ModelTypeStore::RecordList record_list;
   id_list.push_back("id1");
   id_list.push_back("id2");
   result = backend->ReadRecordsWithPrefix("prefix:", id_list, &record_list,
                                           &missing_id_list);
   ASSERT_EQ(ModelTypeStore::Result::SUCCESS, result);
   ASSERT_EQ(2UL, record_list.size());
   ASSERT_TRUE(missing_id_list.empty());
 
   // Delete one record.
-  write_batch.reset(new leveldb::WriteBatch());
+  write_batch = base::MakeUnique<leveldb::WriteBatch>();
   write_batch->Delete("prefix:id2");
   result = backend->WriteModifications(std::move(write_batch));
   ASSERT_EQ(ModelTypeStore::Result::SUCCESS, result);
 
   // Ensure deleted record id is returned in missing_id_list.
   record_list.clear();
   missing_id_list.clear();
   result = backend->ReadRecordsWithPrefix("prefix:", id_list, &record_list,
                                           &missing_id_list);
   ASSERT_EQ(ModelTypeStore::Result::SUCCESS, result);
@@ skipping 45 matching lines @@
   ASSERT_TRUE(backend_second->HasOneRef());
   ASSERT_FALSE(BackendExistsForPath(path));
 
   // delete another backend.
   backend_second = nullptr;
   ASSERT_FALSE(backend_second.get());
   ASSERT_FALSE(BackendExistsForPath("/test_db2"));
 }
 
 }  // namespace syncer