Even though this was more or less out of curiousity, I finally got my answer last week at the SQL Pass Conference in Seattle.
I sat down with an actual developer of Transactional Replication at the "Meet the Experts Lounge". I had a list of questions for him and this was one of them.
As Simon points out, these stored procedures are meant to assist the snapshot process in transactional replication. Basically, while a snapshot of the database is being taken, new transactions are also occuring. While the snapshot is being captured, some transactions may make it into the snapshot and some may not. Therefore, all of the new transactions that occur from the beginning of the snapshot to the end are applied using these procedures. So the insert proc updates the row if it already exists, or it inserts it. The delete proc issues the delete without concern as to whether any rows were affected. The ccs stands for concurrent snapshot.
Simon is correct that these are supposed to be temporary. Mine stick around for some reason. The developer wasnt sure why. But needless to say, my curiousity has been satisfied.