remove unused declaration of VP8Zigzag
remove unused declaration of VP8Zigzag

Change-Id: I80bdf4b692dcdad1fc2b0cfffcaebb5fef5dde34

altogother/webm.libwebp,abwiz0086/webm.libwebp,imazen/libwebp,kleopatra999/webm.libwebp,Aexyn/libwebp,kalli123/webm.libwebp,comoyo/gonzo-libwebp,zofuthan/libwebp,iniwf/webm.libwebp,Distrotech/libwebp,comoyo/gonzo-libwebp,ya7lelkom/libwebp,jiehu5114/libwebp,cysp/libwebp,gshORTON/webm.libwebp,Tekserve/libwebp,matanbs/webm.libwebp,rxl194/libwebp,Maria1099/webm.libwebp,yohunl/libwebp,Acidburn0zzz/webm.libwebp,ya7lelkom/libwebp,yohunl/libwebp,matanbs/webm.libwebp,imazen/libwebp,kleopatra999/webm.libwebp,zofuthan/libwebp,iniwf/webm.libwebp,gshORTON/webm.libwebp,zofuthan/libwebp,comoyo/gonzo-libwebp,keane83/BLE_IM,ericmckean/webm.libwebp,imazen/libwebp,jacklicn/libwebp,PKRoma/libwebp,appunite/libwebp,ericmckean/webm.libwebp,cysp/libwebp,Tekserve/libwebp,webmproject/libwebp,jacklicn/libwebp,ttyangf/libwebp,Acidburn0zzz/webm.libwebp,keane83/BLE_IM,altogother/webm.libwebp,redengineer/libwebp,matanbs/webm.libwebp,kleopatra999/webm.libwebp,Suvarna1488/webm.libwebp,ericmckean/webm.libwebp,ya7lelkom/libwebp,Aexyn/libwebp,appunite/libwebp,Acidburn0zzz/webm.libwebp,webmproject/libwebp,kalli123/webm.libwebp,yohunl/libwebp,zofuthan/libwebp,PKRoma/libwebp,comoyo/gonzo-libwebp,Distrotech/libwebp,abwiz0086/webm.libwebp,kim42083/webm.libwebp,ya7lelkom/libwebp,rxl194/libwebp,Tekserve/libwebp,ttyangf/libwebp,keane83/BLE_IM,appunite/libwebp,Maria1099/webm.libwebp,comoyo/gonzo-libwebp,comoyo/gonzo-libwebp,abwiz0086/webm.libwebp,iniwf/webm.libwebp,gshORTON/webm.libwebp,reimaginemedia/webm.libwebp,kalli123/webm.libwebp,Maria1099/webm.libwebp,kim42083/webm.libwebp,iniwf/webm.libwebp,Suvarna1488/webm.libwebp,matanbs/webm.libwebp,zofuthan/libwebp,gshORTON/webm.libwebp,kalli123/webm.libwebp,appunite/libwebp,Distrotech/libwebp,reimaginemedia/webm.libwebp,rxl194/libwebp,ericmckean/webm.libwebp,redengineer/libwebp,Acidburn0zzz/webm.libwebp,Maria1099/webm.libwebp,appunite/libwebp,ttyangf/libwebp,Tekserve/libwebp,Acidburn0zzz/webm.libwebp,Suvarna1488/webm.libwebp,jiehu5114/libwebp,ttyangf/libwebp,iniwf/webm.libwebp,imazen/libwebp,jiehu5114/libwebp,kleopatra999/webm.libwebp,reimaginemedia/webm.libwebp,ya7lelkom/libwebp,webmproject/libwebp,redengineer/libwebp,yohunl/libwebp,kim42083/webm.libwebp,rxl194/libwebp,yohunl/libwebp,appunite/libwebp,jacklicn/libwebp,abwiz0086/webm.libwebp,webmproject/libwebp,Aexyn/libwebp,kim42083/webm.libwebp,PKRoma/libwebp,Suvarna1488/webm.libwebp,redengineer/libwebp,ttyangf/libwebp,altogother/webm.libwebp,altogother/webm.libwebp,webmproject/libwebp,kim42083/webm.libwebp,comoyo/gonzo-libwebp,jacklicn/libwebp,ericmckean/webm.libwebp,redengineer/libwebp,Suvarna1488/webm.libwebp,jacklicn/libwebp,imazen/libwebp,jiehu5114/libwebp,matanbs/webm.libwebp,rxl194/libwebp,reimaginemedia/webm.libwebp,jiehu5114/libwebp,kleopatra999/webm.libwebp,PKRoma/libwebp,abwiz0086/webm.libwebp,Maria1099/webm.libwebp,cysp/libwebp,cysp/libwebp,keane83/BLE_IM,Aexyn/libwebp,gshORTON/webm.libwebp,PKRoma/libwebp,PKRoma/libwebp,Aexyn/libwebp,altogother/webm.libwebp,keane83/BLE_IM,reimaginemedia/webm.libwebp,kalli123/webm.libwebp