also Back() and Back(nsIWebShell *) existed, and this is bad. Renamed Back(nsIWebShell *) to GoBack(nsIWebShell *). git-svn-id: svn://10.0.0.236/trunk@35709 18797224-902f-48f8-a5cc-f745e15eee43
git-svn-id: svn://10.0.0.236/trunk@24422 18797224-902f-48f8-a5cc-f745e15eee43