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

sync/internal_api/attachments/attachment_service_proxy.cc

Index: sync/internal_api/attachments/attachment_service_proxy.cc
diff --git a/sync/api/attachments/attachment_service_proxy.cc b/sync/internal_api/attachments/attachment_service_proxy.cc
similarity index 98%
rename from sync/api/attachments/attachment_service_proxy.cc
rename to sync/internal_api/attachments/attachment_service_proxy.cc
index 4b9bc6786a4b89dd9d37c8940e0df0a049b3254a..9f408b237f6ae39d7eeedf7bfe4900d6a93117ff 100644
--- a/sync/api/attachments/attachment_service_proxy.cc
+++ b/sync/internal_api/attachments/attachment_service_proxy.cc
@@ -2,12 +2,11 @@
 // 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_proxy.h"
+#include "sync/internal_api/public/attachments/attachment_service_proxy.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/thread_task_runner_handle.h"
-#include "sync/api/sync_data.h"
 
 namespace syncer {