Fixes for the following bugs:
#67970 - Fix MfcEmbed to reflect the FindNamedBrowserItem changes
#68190 - MfcEmbed must turn on Single Sign-on Support by default.
#68225 - MfcEMbed should implement nsIwebBrowserFind
r=adamlock, r=ccarlen
git-svn-id: svn://10.0.0.236/trunk@86806 18797224-902f-48f8-a5cc-f745e15eee43