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

components/sync/engine/attachments/on_disk_attachment_store.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/engine/attachments/on_disk_attachment_store.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/sequenced_task_runner.h"
 #include "components/sync/engine/attachments/attachment_util.h"
 #include "components/sync/engine_impl/attachments/proto/attachment_store.pb.h"
 #include "components/sync/protocol/attachments.pb.h"
 #include "third_party/leveldatabase/env_chromium.h"
 #include "third_party/leveldatabase/src/include/leveldb/db.h"
 #include "third_party/leveldatabase/src/include/leveldb/options.h"
 #include "third_party/leveldatabase/src/include/leveldb/slice.h"
 #include "third_party/leveldatabase/src/include/leveldb/status.h"
@@ skipping 403 matching lines @@
   if (record_metadata.has_crc32c()) {
     if (record_metadata.crc32c() != crc32c) {
       DVLOG(1) << "Attachment crc32c does not match value read from store";
       return attachment;
     }
     if (record_metadata.crc32c() != attachment_id.GetCrc32c()) {
       DVLOG(1) << "Attachment crc32c does not match value in AttachmentId";
       return attachment;
     }
   }
-  attachment.reset(
-      new Attachment(Attachment::CreateFromParts(attachment_id, data)));
+  attachment = base::MakeUnique<Attachment>(
+      Attachment::CreateFromParts(attachment_id, data));
   return attachment;
 }
 
 bool OnDiskAttachmentStore::WriteSingleAttachment(
     const Attachment& attachment,
     AttachmentStore::Component component) {
   const std::string metadata_key =
       MakeMetadataKeyFromAttachmentId(attachment.GetId());
   const std::string data_key = MakeDataKeyFromAttachmentId(attachment.GetId());
 
@@ skipping 81 matching lines @@
   return key;
 }
 
 AttachmentMetadata OnDiskAttachmentStore::MakeAttachmentMetadata(
     const AttachmentId& attachment_id,
     const attachment_store_pb::RecordMetadata& record_metadata) {
   return AttachmentMetadata(attachment_id, record_metadata.attachment_size());
 }
 
 }  // namespace syncer