[Sync] Move attachments code out of core/.

components/sync/engine/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 COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_DOWNLOADER_H_
-#define COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_DOWNLOADER_H_
+#ifndef COMPONENTS_SYNC_ENGINE_ATTACHMENTS_ATTACHMENT_DOWNLOADER_H_
+#define COMPONENTS_SYNC_ENGINE_ATTACHMENTS_ATTACHMENT_DOWNLOADER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "components/sync/api/attachments/attachment.h"
 #include "components/sync/base/model_type.h"
 #include "google_apis/gaia/oauth2_token_service_request.h"
 
 namespace net {
@@ skipping 20 matching lines @@
   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.
+  // Create an instance of AttachmentDownloader.
+  //
   // |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 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  // COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_DOWNLOADER_H_
+#endif  // COMPONENTS_SYNC_ENGINE_ATTACHMENTS_ATTACHMENT_DOWNLOADER_H_