[Sync] Move attachments code out of core/.

components/sync/core_impl/attachments/fake_attachment_downloader.cc

Index: components/sync/core_impl/attachments/fake_attachment_downloader.cc
diff --git a/components/sync/core_impl/attachments/fake_attachment_downloader.cc b/components/sync/core_impl/attachments/fake_attachment_downloader.cc
deleted file mode 100644
index 6755c761c87ba4bd73149b3d7de489c363d54164..0000000000000000000000000000000000000000
--- a/components/sync/core_impl/attachments/fake_attachment_downloader.cc
+++ /dev/null
@@ -1,36 +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.
-
-#include "components/sync/core/attachments/fake_attachment_downloader.h"
-
-#include "base/bind.h"
-#include "base/location.h"
-#include "base/single_thread_task_runner.h"
-#include "base/threading/thread_task_runner_handle.h"
-#include "components/sync/core/attachments/attachment_util.h"
-
-namespace syncer {
-
-FakeAttachmentDownloader::FakeAttachmentDownloader() {}
-
-FakeAttachmentDownloader::~FakeAttachmentDownloader() {
-  DCHECK(CalledOnValidThread());
-}
-
-void FakeAttachmentDownloader::DownloadAttachment(
-    const AttachmentId& attachment_id,
-    const DownloadCallback& callback) {
-  DCHECK(CalledOnValidThread());
-  // This is happy fake downloader, it always successfully downloads empty
-  // attachment.
-  scoped_refptr<base::RefCountedMemory> data(new base::RefCountedBytes());
-  std::unique_ptr<Attachment> attachment;
-  attachment.reset(
-      new Attachment(Attachment::CreateFromParts(attachment_id, data)));
-  base::ThreadTaskRunnerHandle::Get()->PostTask(
-      FROM_HERE,
-      base::Bind(callback, DOWNLOAD_SUCCESS, base::Passed(&attachment)));
-}
-
-}  // namespace syncer