Convert //sync from scoped_ptr to std::unique_ptr

sync/internal_api/public/attachments/on_disk_attachment_store.h

 // 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.
 
 #ifndef SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ON_DISK_ATTACHMENT_STORE_H_
 #define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ON_DISK_ATTACHMENT_STORE_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 53 matching lines @@
       const AttachmentStore::ReadMetadataCallback& callback) override;
 
  private:
   friend class OnDiskAttachmentStoreSpecificTest;
 
   // Opens leveldb database at |path|, creating it if needed. In the future
   // upgrade code will be invoked from OpenOrCreate as well. If open fails
   // result is UNSPECIFIED_ERROR.
   AttachmentStore::Result OpenOrCreate(const base::FilePath& path);
   // Reads single attachment from store. Returns nullptr in case of errors.
-  scoped_ptr<Attachment> ReadSingleAttachment(
+  std::unique_ptr<Attachment> ReadSingleAttachment(
       const AttachmentId& attachment_id,
       AttachmentStore::Component component);
   // Writes single attachment to store. Returns false in case of errors.
   bool WriteSingleAttachment(const Attachment& attachment,
                              AttachmentStore::Component component);
   // Reads single attachment_store_pb::RecordMetadata from levelDB into the
   // provided buffer. Returns false in case of an error.
   bool ReadSingleRecordMetadata(
       const AttachmentId& attachment_id,
       attachment_store_pb::RecordMetadata* record_metadata);
   // Writes single attachment_store_pb::RecordMetadata to levelDB. Returns false
   // in case of an error.
   bool WriteSingleRecordMetadata(
       const AttachmentId& attachment_id,
       const attachment_store_pb::RecordMetadata& record_metadata);
 
   static std::string MakeDataKeyFromAttachmentId(
       const AttachmentId& attachment_id);
   static std::string MakeMetadataKeyFromAttachmentId(
       const AttachmentId& attachment_id);
   static AttachmentMetadata MakeAttachmentMetadata(
       const AttachmentId& attachment_id,
       const attachment_store_pb::RecordMetadata& record_metadata);
 
   const base::FilePath path_;
-  scoped_ptr<leveldb::DB> db_;
+  std::unique_ptr<leveldb::DB> db_;
 
   DISALLOW_COPY_AND_ASSIGN(OnDiskAttachmentStore);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ON_DISK_ATTACHMENT_STORE_H_