a bogus content type on the news article (when it's forwarded as an attachment)
Bug #48135 --> fix forwarding of news messages bustage. Clear the channel listener
and re-generate it every time we load a url.
r=bienvenu
git-svn-id: svn://10.0.0.236/trunk@75943 18797224-902f-48f8-a5cc-f745e15eee43