an override to cause all SOAP responses to be parsed as XML, whatever the reported MIME type is. r=heikki, sr=vidur, a=asa for checkin to the 0.9.9 branch and the 1.0 trunk. git-svn-id: svn://10.0.0.236/trunk@116200 18797224-902f-48f8-a5cc-f745e15eee43