Bug 828154: update usrsctp to revision 8397 from upstream rs=mcmanus
Bug 828154: reapply local patches to netwerk/sctp/src rs=mcmanus
Backed out changeset 23bb4a03ef34 (bug 815418) because of possible xpcshell bustage

--HG--
extra : rebase_source : dcd383efb1c245239a2dc4bc261ada158bb131c2