Adapted MSRPChat to the new stream hold interface

Ignore-this: bc42c43772bdb83b8ca03f54710bb86f

darcs-hash:20090723083522-1e3d8-511e606da42555a5fdd1ef39c9bf6773f97c4ec8
Adapted MSRPDesktop to the new stream hold interface

Ignore-this: 48128cf9ec2d3ef75d4cd466ade0d0ab

darcs-hash:20090723083536-1e3d8-a82a94c9670e3c670b942718d19b72f7b21d8575