Move non-API code out of sync/api/attachments/

sync/api/attachments/attachment_service.cc

Index: sync/api/attachments/attachment_service.cc
diff --git a/sync/api/attachments/attachment_service.cc b/sync/api/attachments/attachment_service.cc
deleted file mode 100644
index 44727d53b9de108c99e5fd420963ba92587610e2..0000000000000000000000000000000000000000
--- a/sync/api/attachments/attachment_service.cc
+++ /dev/null
@@ -1,12 +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 "sync/api/attachments/attachment_service.h"
-
-namespace syncer {
-
-AttachmentService::AttachmentService() {}
-AttachmentService::~AttachmentService() {}
-
-}  // namespace syncer