[Sync] Move attachments code out of core/.

components/sync/core/attachments/fake_attachment_downloader.h

Index: components/sync/core/attachments/fake_attachment_downloader.h
diff --git a/components/sync/core/attachments/fake_attachment_downloader.h b/components/sync/core/attachments/fake_attachment_downloader.h
deleted file mode 100644
index 68a224af5dad76ff295d9f05d5b14bacbbb06810..0000000000000000000000000000000000000000
--- a/components/sync/core/attachments/fake_attachment_downloader.h
+++ /dev/null
@@ -1,32 +0,0 @@
-// 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_FAKE_ATTACHMENT_DOWNLOADER_H_
-#define COMPONENTS_SYNC_CORE_ATTACHMENTS_FAKE_ATTACHMENT_DOWNLOADER_H_
-
-#include "base/macros.h"
-#include "base/threading/non_thread_safe.h"
-#include "components/sync/core/attachments/attachment_downloader.h"
-
-namespace syncer {
-
-// FakeAttachmentDownloader is for tests. For every request it posts a success
-// callback with empty attachment.
-class 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  // COMPONENTS_SYNC_CORE_ATTACHMENTS_FAKE_ATTACHMENT_DOWNLOADER_H_