Minor cleanups to track.cc.
Minor cleanups to track.cc.
leoujz/libmv,Danath/libmv,leoujz/libmv,hjm168168/libmv,Ashwinning/libmv,pombreda/libmv,tanmengwen/libmv,KangKyungSoo/libmv,guivi01/libmv,Shinohara-Takayuki/libmv,manjunathnarayana/libmv,jackyspeed/libmv,sanyaade-g2g-repos/libmv,Shinohara-Takayuki/libmv,KangKyungSoo/libmv,guivi01/libmv,Danath/libmv,hjm168168/libmv,Danath/libmv,guivi01/libmv,manjunathnarayana/libmv,hjm168168/libmv,pombreda/libmv,sanyaade-g2g-repos/libmv,Shinohara-Takayuki/libmv,tanmengwen/libmv,Danath/libmv,tanmengwen/libmv,Shinohara-Takayuki/libmv,pombreda/libmv,Ashwinning/libmv,Ashwinning/libmv,KangKyungSoo/libmv,KangKyungSoo/libmv,jackyspeed/libmv,tanmengwen/libmv,Ashwinning/libmv,hjm168168/libmv,jackyspeed/libmv,manjunathnarayana/libmv,leoujz/libmv,guivi01/libmv,pombreda/libmv,sanyaade-g2g-repos/libmv,leoujz/libmv,jackyspeed/libmv,sanyaade-g2g-repos/libmv,manjunathnarayana/libmv