[Sync] USS: Ignore encryption changes during conflict resolution 1/2

sync/internal_api/public/non_blocking_sync_common.cc

Index: sync/internal_api/public/non_blocking_sync_common.cc
diff --git a/sync/internal_api/public/non_blocking_sync_common.cc b/sync/internal_api/public/non_blocking_sync_common.cc
index 7f7c8f966672a94a6fe0384821b8175f05341884..df4f19b331dafb4ae9fb9786214ac20ccf6d3b4f 100644
--- a/sync/internal_api/public/non_blocking_sync_common.cc
+++ b/sync/internal_api/public/non_blocking_sync_common.cc
@@ -14,6 +14,9 @@ CommitRequestData::~CommitRequestData() {}
 
 CommitResponseData::CommitResponseData() {}
 
+CommitResponseData::CommitResponseData(const CommitResponseData& other) =
+    default;
+
 CommitResponseData::~CommitResponseData() {}
 
 UpdateResponseData::UpdateResponseData() {}