Revert "Perform closing handshake when connection ends"
Revert "Perform closing handshake when connection ends"

The fix we thought would fix the "invalid frame header" message in Chrome made
it worse by now giving a "Close after close" message even in cases where there
was no error before.

This reverts commit 2de70c2cc8b7484b57d007a052774c6185078d7d.

channable/icepeak,channable/icepeak,channable/icepeak