dechunking filter removed.

add HTTP_IN filter after the headers have been parsed.
so that the HTTP_IN can check them ;-)
Still not 100% if this works properly, but I don't get
the chunking numbers displayed on my browser,
so it's better than what was there.
PR:
Obtained from:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91370 13f79535-47bb-0310-9956-ffa450edef68