[Sync] Move //sync to //components/sync.

sync/internal_api/public/attachments/fake_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_FAKE_ATTACHMENT_DOWNLOADER_H_
-#define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_FAKE_ATTACHMENT_DOWNLOADER_H_
-
-#include "base/macros.h"
-#include "base/threading/non_thread_safe.h"
-#include "sync/internal_api/public/attachments/attachment_downloader.h"
-
-namespace syncer {
-
-// FakeAttachmentDownloader is for tests. For every request it posts a success
-// callback with empty attachment.
-class SYNC_EXPORT FakeAttachmentDownloader : public AttachmentDownloader,
-                                             public base::NonThreadSafe {
- public:
-  FakeAttachmentDownloader();
-  ~FakeAttachmentDownloader() override;
-
-  // AttachmentDownloader implementation.
-  void DownloadAttachment(const AttachmentId& attachment_id,
-                          const DownloadCallback& callback) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(FakeAttachmentDownloader);
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_FAKE_ATTACHMENT_DOWNLOADER_H_