[MERGE][1.14] simplify the content filter registration API

[Bob Tanner]

On 2009-04-06 16:50:57 -0500, Ian Clatworthy 
<ian.clatworthy at internode.on.net> said:

> Thanks Bob. Can you please cherrypick this into that branch?

Done.

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Bob Tanner <tanner at real-time.com>                  | Phone : (952 943-8700
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