Convert //sync from scoped_ptr to std::unique_ptr

sync/internal_api/public/attachments/attachment_downloader.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_ATTACHMENT_DOWNLOADER_H_
 #define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_DOWNLOADER_H_
 
+#include <memory>
 #include <string>
 
 #include "base/callback.h"
-#include "base/memory/scoped_ptr.h"
 #include "google_apis/gaia/oauth2_token_service_request.h"
 #include "sync/api/attachments/attachment.h"
 #include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 
 namespace net {
 class URLRequestContextGetter;
 }  // namespace net
 
 namespace syncer {
 
 // AttachmentDownloader is responsible for downloading attachments from server.
 class SYNC_EXPORT AttachmentDownloader {
  public:
   // The result of a DownloadAttachment operation.
   enum DownloadResult {
     DOWNLOAD_SUCCESS,            // No error, attachment was downloaded
                                  // successfully.
     DOWNLOAD_TRANSIENT_ERROR,    // A transient error occurred, try again later.
     DOWNLOAD_UNSPECIFIED_ERROR,  // An unspecified error occurred.
   };
 
-  typedef base::Callback<void(const DownloadResult&, scoped_ptr<Attachment>)>
+  typedef base::Callback<void(const DownloadResult&,
+                              std::unique_ptr<Attachment>)>
       DownloadCallback;
 
   virtual ~AttachmentDownloader();
 
   // Download attachment referred by |attachment_id| and invoke |callback| when
   // done.
   //
   // |callback| will receive a DownloadResult code and an Attachment object. If
   // DownloadResult is not DOWNLOAD_SUCCESS then attachment pointer is NULL.
   virtual void DownloadAttachment(const AttachmentId& attachment_id,
                                   const DownloadCallback& callback) = 0;
 
   // Create instance of AttachmentDownloaderImpl.
   // |sync_service_url| is the URL of the sync service.
   //
   // |url_request_context_getter| provides a URLRequestContext.
   //
   // |account_id| is the account id to use for downloads.
   //
   // |scopes| is the set of scopes to use for downloads.
   //
   // |token_service_provider| provides an OAuth2 token service.
   //
   // |store_birthday| is the raw, sync store birthday.
   //
   // |model_type| is the model type this downloader is used with.
-  static scoped_ptr<AttachmentDownloader> Create(
+  static std::unique_ptr<AttachmentDownloader> Create(
       const GURL& sync_service_url,
       const scoped_refptr<net::URLRequestContextGetter>&
           url_request_context_getter,
       const std::string& account_id,
       const OAuth2TokenService::ScopeSet scopes,
       const scoped_refptr<OAuth2TokenServiceRequest::TokenServiceProvider>&
           token_service_provider,
       const std::string& store_birthday,
       ModelType model_type);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_DOWNLOADER_H_