[issue6916] Remove deprecated items from asynchat

[Roundup Robot]

Roundup Robot added the comment:

New changeset 486c1a81ee32 by Berker Peksag in branch 'default':
Issue #6916: Use assertWarns in test_asynchat.
http://hg.python.org/cpython/rev/486c1a81ee32

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