remove unnecessary virtual function
remove unnecessary virtual function

ykwd/rDSN,Microsoft/rDSN,shengofsun/rDSN,qinzuoyan/rDSN,qinzuoyan/rDSN,mcfatealan/rDSN,imzhenyu/rDSN,imzhenyu/rDSN,pandaworrior/rDSN,ykwd/rDSN,glglwty/rDSN,lshmouse/rDSN,imzhenyu/rDSN,glglwty/rDSN,goksyli/rDSN,pandaworrior/rDSN,Microsoft/rDSN,qinzuoyan/rDSN,shengofsun/rDSN,imzhenyu/rDSN,Microsoft/rDSN,shengofsun/rDSN,Microsoft/rDSN,qinzuoyan/rDSN,imzhenyu/rDSN,ykwd/rDSN,lshmouse/rDSN,pandaworrior/rDSN,Microsoft/rDSN,lshmouse/rDSN,ykwd/rDSN,pandaworrior/rDSN,shengofsun/rDSN,goksyli/rDSN,mcfatealan/rDSN,glglwty/rDSN,qinzuoyan/rDSN,glglwty/rDSN,Microsoft/rDSN,lshmouse/rDSN,imzhenyu/rDSN,pandaworrior/rDSN,mcfatealan/rDSN,Microsoft/rDSN,ykwd/rDSN,qinzuoyan/rDSN,lshmouse/rDSN,qinzuoyan/rDSN,Microsoft/rDSN,shengofsun/rDSN,mcfatealan/rDSN,shengofsun/rDSN,lshmouse/rDSN,qinzuoyan/rDSN,goksyli/rDSN,shengofsun/rDSN,lshmouse/rDSN,lshmouse/rDSN,goksyli/rDSN,imzhenyu/rDSN,imzhenyu/rDSN,glglwty/rDSN,shengofsun/rDSN