[MERGE/RFC] Use _read_records_iter_unchecked in _get_remaining_record_stream.

[John Arbash Meinel]

John Arbash Meinel has voted tweak.
Status is now: Conditionally approved
Comment:
just as a comment, I think doing it on the *insert* side is more correct 
anyway. (You can generally trust what you already have, this is about 
trusting what someone else is giving you.)

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C20090306005040.GA857%40steerpike.home.puzzling.org%3E
Project: Bazaar