DO NOT MERGE: Fix a bug where the sequence numbers would be wrong

The spell checker cannot afford to return static objects,
seeing as the framework will then use the same objects to
pair the cookie and sequence ids to the request.
This is a backport of Ia9c3a933

Bug: 5503243
Change-Id: Ia9c3a933bfb30cf5525418b240ef60632d72c9d0