Replace DictMixin in twisted.web.http_headers with MutableMapping
|Reported by:||vperic||Owned by:|
In Python 3, DictMixin is no longer provided and should be replaced with MutableMapping (which is available in Python 2.6+). This involves, at least, defining a len method for the _DictHeaders class.
./twisted/web/http_headers.py:10:from UserDict import DictMixin
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