replace default "default char" from "?" to "_". r=ftang, sr=alecf. git-svn-id: svn://10.0.0.236/trunk@119069 18797224-902f-48f8-a5cc-f745e15eee43
replace default "default char" from "?" to "_". r=ftang, sr=alecf. git-svn-id: svn://10.0.0.236/trunk@119069 18797224-902f-48f8-a5cc-f745e15eee43