Deprecated in patch 4.3, though it had become useless even before then. (The quests it was used in had been removed post-Shattering.)
See also: Wowpedia: Frayed Abomination Stitching
It isn't actually deprecated since it still drops in the game. It's just obsolete now.
For the record to everyone: We are disputing the usage of the term "deprecate".
And everyone knows I am correct. :P