[issue6916] Remove deprecated items from asynchat

[Roundup Robot]

Roundup Robot added the comment:

New changeset 233168a2a656 by Giampaolo Rodola' in branch 'default':
#6916: raise a deprecation warning if using asynchat.fifo
http://hg.python.org/cpython/rev/233168a2a656

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<http://bugs.python.org/issue6916>
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