Removing unused tree_update_hist[] array.
Removing unused tree_update_hist[] array.

Change-Id: If2e8e06c74d065323523904ff1771590fd48cabc

shareefalis/libvpx,webmproject/libvpx,shacklettbp/aom,smarter/aom,VTCSecureLLC/libvpx,WebRTC-Labs/libvpx,webmproject/libvpx,shareefalis/libvpx,Suvarna1488/webm.libvpx,pcwalton/libvpx,matanbs/vp982,abwiz0086/webm.libvpx,Suvarna1488/webm.libvpx,thdav/aom,Suvarna1488/webm.libvpx,mbebenita/aom,n4t/libvpx,thdav/aom,altogother/webm.libvpx,lyx2014/libvpx_c,smarter/aom,shacklettbp/aom,liqianggao/libvpx,Suvarna1488/webm.libvpx,ittiamvpx/libvpx,ittiamvpx/libvpx,Laknot/libvpx,kim42083/webm.libvpx,running770/libvpx,hsueceumd/test_hui,openpeer/libvpx_new,matanbs/vp982,mwgoldsmith/vpx,gshORTON/webm.libvpx,zofuthan/libvpx,pcwalton/libvpx,gshORTON/webm.libvpx,WebRTC-Labs/libvpx,mwgoldsmith/vpx,Distrotech/libvpx,lyx2014/libvpx_c,webmproject/libvpx,kalli123/webm.libvpx,matanbs/webm.libvpx,mwgoldsmith/vpx,stewnorriss/libvpx,GrokImageCompression/aom,mwgoldsmith/libvpx,matanbs/vp982,iniwf/webm.libvpx,openpeer/libvpx_new,matanbs/webm.libvpx,Topopiccione/libvpx,ittiamvpx/libvpx-1,charup/https---github.com-webmproject-libvpx-,shyamalschandra/libvpx,ittiamvpx/libvpx-1,mbebenita/aom,kalli123/webm.libvpx,luctrudeau/aom,stewnorriss/libvpx,hsueceumd/test_hui,webmproject/libvpx,liqianggao/libvpx,iniwf/webm.libvpx,jmvalin/aom,pcwalton/libvpx,matanbs/webm.libvpx,jdm/libvpx,Topopiccione/libvpx,jacklicn/webm.libvpx,pcwalton/libvpx,shacklettbp/aom,felipebetancur/libvpx,Maria1099/webm.libvpx,jmvalin/aom,altogother/webm.libvpx,gshORTON/webm.libvpx,smarter/aom,shyamalschandra/libvpx,kalli123/webm.libvpx,liqianggao/libvpx,mwgoldsmith/libvpx,abwiz0086/webm.libvpx,WebRTC-Labs/libvpx,GrokImageCompression/aom,mbebenita/aom,webmproject/libvpx,stewnorriss/libvpx,zofuthan/libvpx,VTCSecureLLC/libvpx,running770/libvpx,altogother/webm.libvpx,Maria1099/webm.libvpx,Acidburn0zzz/webm.libvpx,hsueceumd/test_hui,mbebenita/aom,Acidburn0zzz/webm.libvpx,jmvalin/aom,smarter/aom,Laknot/libvpx,kleopatra999/webm.libvpx,altogother/webm.libvpx,kleopatra999/webm.libvpx,iniwf/webm.libvpx,matanbs/webm.libvpx,kleopatra999/webm.libvpx,gshORTON/webm.libvpx,liqianggao/libvpx,pcwalton/libvpx,mbebenita/aom,ittiamvpx/libvpx-1,ittiamvpx/libvpx-1,Distrotech/libvpx,shareefalis/libvpx,matanbs/vp982,kleopatra999/webm.libvpx,smarter/aom,hsueceumd/test_hui,ShiftMediaProject/libvpx,n4t/libvpx,iniwf/webm.libvpx,GrokImageCompression/aom,gshORTON/webm.libvpx,ShiftMediaProject/libvpx,thdav/aom,felipebetancur/libvpx,jdm/libvpx,n4t/libvpx,matanbs/webm.libvpx,VTCSecureLLC/libvpx,iniwf/webm.libvpx,Acidburn0zzz/webm.libvpx,reimaginemedia/webm.libvpx,luctrudeau/aom,altogother/webm.libvpx,shacklettbp/aom,Acidburn0zzz/webm.libvpx,liqianggao/libvpx,lyx2014/libvpx_c,charup/https---github.com-webmproject-libvpx-,reimaginemedia/webm.libvpx,mbebenita/aom,pcwalton/libvpx,goodleixiao/vpx,jdm/libvpx,kim42083/webm.libvpx,matanbs/vp982,mwgoldsmith/libvpx,Acidburn0zzz/webm.libvpx,n4t/libvpx,abwiz0086/webm.libvpx,ShiftMediaProject/libvpx,Topopiccione/libvpx,stewnorriss/libvpx,openpeer/libvpx_new,Maria1099/webm.libvpx,jdm/libvpx,running770/libvpx,kleopatra999/webm.libvpx,Topopiccione/libvpx,ittiamvpx/libvpx,VTCSecureLLC/libvpx,smarter/aom,Suvarna1488/webm.libvpx,mwgoldsmith/vpx,mbebenita/aom,mwgoldsmith/vpx,ittiamvpx/libvpx-1,charup/https---github.com-webmproject-libvpx-,luctrudeau/aom,jmvalin/aom,felipebetancur/libvpx,WebRTC-Labs/libvpx,Laknot/libvpx,Maria1099/webm.libvpx,running770/libvpx,thdav/aom,hsueceumd/test_hui,reimaginemedia/webm.libvpx,shyamalschandra/libvpx,Laknot/libvpx,matanbs/webm.libvpx,jmvalin/aom,lyx2014/libvpx_c,felipebetancur/libvpx,shareefalis/libvpx,shareefalis/libvpx,abwiz0086/webm.libvpx,jacklicn/webm.libvpx,luctrudeau/aom,openpeer/libvpx_new,liqianggao/libvpx,Maria1099/webm.libvpx,kim42083/webm.libvpx,thdav/aom,jdm/libvpx,VTCSecureLLC/libvpx,goodleixiao/vpx,kalli123/webm.libvpx,n4t/libvpx,mbebenita/aom,stewnorriss/libvpx,ShiftMediaProject/libvpx,jacklicn/webm.libvpx,Laknot/libvpx,Distrotech/libvpx,Maria1099/webm.libvpx,openpeer/libvpx_new,reimaginemedia/webm.libvpx,jdm/libvpx,lyx2014/libvpx_c,mwgoldsmith/libvpx,shyamalschandra/libvpx,mwgoldsmith/vpx,openpeer/libvpx_new,shacklettbp/aom,luctrudeau/aom,jacklicn/webm.libvpx,Topopiccione/libvpx,shacklettbp/aom,goodleixiao/vpx,zofuthan/libvpx,zofuthan/libvpx,thdav/aom,goodleixiao/vpx,Laknot/libvpx,Acidburn0zzz/webm.libvpx,zofuthan/libvpx,Distrotech/libvpx,felipebetancur/libvpx,abwiz0086/webm.libvpx,kalli123/webm.libvpx,webmproject/libvpx,WebRTC-Labs/libvpx,jacklicn/webm.libvpx,mwgoldsmith/libvpx,running770/libvpx,gshORTON/webm.libvpx,jmvalin/aom,lyx2014/libvpx_c,shyamalschandra/libvpx,kim42083/webm.libvpx,abwiz0086/webm.libvpx,running770/libvpx,mbebenita/aom,reimaginemedia/webm.libvpx,ittiamvpx/libvpx,ittiamvpx/libvpx,charup/https---github.com-webmproject-libvpx-,Suvarna1488/webm.libvpx,matanbs/vp982,jacklicn/webm.libvpx,VTCSecureLLC/libvpx,altogother/webm.libvpx,shyamalschandra/libvpx,Distrotech/libvpx,ittiamvpx/libvpx,luctrudeau/aom,iniwf/webm.libvpx,kalli123/webm.libvpx,stewnorriss/libvpx,GrokImageCompression/aom,Distrotech/libvpx,shareefalis/libvpx,charup/https---github.com-webmproject-libvpx-,Topopiccione/libvpx,GrokImageCompression/aom,mwgoldsmith/libvpx,GrokImageCompression/aom,ShiftMediaProject/libvpx,charup/https---github.com-webmproject-libvpx-,felipebetancur/libvpx,reimaginemedia/webm.libvpx,ittiamvpx/libvpx-1,hsueceumd/test_hui,matanbs/vp982,zofuthan/libvpx,kim42083/webm.libvpx,kleopatra999/webm.libvpx,goodleixiao/vpx,goodleixiao/vpx,kim42083/webm.libvpx