go.tools/oracle: remove stale item
go.tools/oracle: remove stale item

LGTM=crawshaw
R=crawshaw
CC=golang-codereviews
https://golang.org/cl/101320043

syreclabs/go-tools,springning/tools,jdhenke/tools,dmitris/tools,springning/tools,jdhenke/tools,nicot/tools,jdhenke/tools,runcom/tools,syreclabs/go-tools,runcom/tools,cw2018/tools,maddyonline/tools,glasser/golang-tools,cmars/tools,golang/tools,maddyonline/tools,golang/tools,cw2018/tools,cw2018/tools,magiccao/tools,maddyonline/tools,argandas/tools,4ad/tools,syreclabs/go-tools,josharian/tools,runcom/tools,josharian/tools,golang/tools,4ad/tools,matryer/tools,springning/tools,golang/tools,nicot/tools,magiccao/tools,matryer/tools,argandas/tools,cmars/tools,cw2018/tools,glasser/golang-tools,maddyonline/tools,magiccao/tools,nicot/tools,jdhenke/tools,matryer/tools,dmitris/tools,springning/tools,dmitris/tools,glasser/golang-tools,4ad/tools,nicot/tools,sshetty10/tools,josharian/tools,syreclabs/go-tools,josharian/tools,argandas/tools,syreclabs/go-tools,sshetty10/tools,runcom/tools,sshetty10/tools,argandas/tools,glasser/golang-tools,syreclabs/go-tools,matryer/tools,golang/tools,cmars/tools,magiccao/tools,dmitris/tools,cmars/tools,sshetty10/tools