Update sync API to support attachments.

sync/api/attachments/attachment_service.cc

Index: sync/api/attachments/attachment_service.cc
diff --git a/sync/api/attachments/attachment_store.cc b/sync/api/attachments/attachment_service.cc
similarity index 60%
copy from sync/api/attachments/attachment_store.cc
copy to sync/api/attachments/attachment_service.cc
index e22b040e3dec3e691b35179b5dc3bae05bb18927..44727d53b9de108c99e5fd420963ba92587610e2 100644
--- a/sync/api/attachments/attachment_store.cc
+++ b/sync/api/attachments/attachment_service.cc
@@ -2,11 +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_store.h"
+#include "sync/api/attachments/attachment_service.h"
 
 namespace syncer {
 
-AttachmentStore::AttachmentStore() {}
-AttachmentStore::~AttachmentStore() {}
+AttachmentService::AttachmentService() {}
+AttachmentService::~AttachmentService() {}
 
 }  // namespace syncer