[Sync] Move attachments code out of core/.

components/sync/engine/attachments/fake_attachment_downloader.cc

Index: components/sync/engine/attachments/fake_attachment_downloader.cc
diff --git a/components/sync/core_impl/attachments/fake_attachment_downloader.cc b/components/sync/engine/attachments/fake_attachment_downloader.cc
similarity index 88%
rename from components/sync/core_impl/attachments/fake_attachment_downloader.cc
rename to components/sync/engine/attachments/fake_attachment_downloader.cc
index 6755c761c87ba4bd73149b3d7de489c363d54164..a043c670937abc07268e08ae4b75c38fadaaf660 100644
--- a/components/sync/core_impl/attachments/fake_attachment_downloader.cc
+++ b/components/sync/engine/attachments/fake_attachment_downloader.cc
@@ -2,13 +2,13 @@
 // 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 "components/sync/engine/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"
+#include "components/sync/engine/attachments/attachment_util.h"
 
 namespace syncer {