Remove unused start_unanchored_ member from DFA class.
Remove unused start_unanchored_ member from DFA class.

This is a followup to d69e99b.

Change-Id: I6b714168b988de0c38d6ae481cf0477fc4115c0d
Reviewed-on: https://code-review.googlesource.com/2942
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

pombredanne/re2,wanggchongg/re2,pombredanne/re2,pombredanne/re2,yanqingmen/re2,simudream/re2,lnussbaum/re2,rAntonioh/re2,google/re2,lnussbaum/re2,simudream/re2,Cfretz244/re2,Cfretz244/re2,evilmucedin/re2,pombredanne/re2,lnussbaum/re2,driskell/re2-1,wanggchongg/re2,ElectronicRU/re2,yanqingmen/re2,rAntonioh/re2,ElectronicRU/re2,lnussbaum/re2,yanqingmen/re2,Cfretz244/re2,simudream/re2,rAntonioh/re2,pombredanne/re2,evilmucedin/re2,ElectronicRU/re2,yanqingmen/re2,rAntonioh/re2,google/re2,driskell/re2-1,simudream/re2,bowlofstew/re2,simudream/re2,driskell/re2-1,bowlofstew/re2,rAntonioh/re2,evilmucedin/re2,bowlofstew/re2,bowlofstew/re2,lnussbaum/re2,driskell/re2-1,Cfretz244/re2,bowlofstew/re2,google/re2,driskell/re2-1,ElectronicRU/re2,google/re2,wanggchongg/re2,wanggchongg/re2,Cfretz244/re2,ElectronicRU/re2,google/re2,evilmucedin/re2,evilmucedin/re2,wanggchongg/re2,yanqingmen/re2