Revert "Merge pull request #2935 from w3c/redefine-codecs"
This reverts commit dc1fc15194d45f4535e0ee5186540469e2f85360, reversing
changes made to 3d6e620cab9755263618d35a428d3d63001111bf.
Reason for revert is the changes to [[ReceiveCodecs]] were incompatible.
