This is an addition patch to deal with gb18030 broadness. If there are only 2 verifiers left, and one of them is gb18030, we drop gb18030 and return the other one. r=ftang, sr=scc git-svn-id: svn://10.0.0.236/trunk@119746 18797224-902f-48f8-a5cc-f745e15eee43