Fix channels used by WaitWrite (http server hangs on writes which hit EAGAIN).
Fix channels used by WaitWrite (http server hangs on writes
which hit EAGAIN).

R=rsc
APPROVED=rsc
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=27955
CL=28054

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go