Remove unused backend methods
Remove unused backend methods

jirutka/gitlabhq,mmkassem/gitlabhq,htve/GitlabForChinese,axilleas/gitlabhq,mr-dxdy/gitlabhq,darkrasid/gitlabhq,darkrasid/gitlabhq,darkrasid/gitlabhq,martijnvermaat/gitlabhq,LUMC/gitlabhq,LUMC/gitlabhq,shinexiao/gitlabhq,larryli/gitlabhq,allysonbarros/gitlabhq,martijnvermaat/gitlabhq,icedwater/gitlabhq,Soullivaneuh/gitlabhq,mr-dxdy/gitlabhq,dwrensha/gitlabhq,dwrensha/gitlabhq,SVArago/gitlabhq,t-zuehlsdorff/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,axilleas/gitlabhq,screenpages/gitlabhq,mmkassem/gitlabhq,icedwater/gitlabhq,dreampet/gitlab,htve/GitlabForChinese,dplarson/gitlabhq,shinexiao/gitlabhq,SVArago/gitlabhq,icedwater/gitlabhq,dplarson/gitlabhq,larryli/gitlabhq,mr-dxdy/gitlabhq,axilleas/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,t-zuehlsdorff/gitlabhq,jirutka/gitlabhq,SVArago/gitlabhq,Soullivaneuh/gitlabhq,jirutka/gitlabhq,dwrensha/gitlabhq,dreampet/gitlab,Soullivaneuh/gitlabhq,icedwater/gitlabhq,screenpages/gitlabhq,LUMC/gitlabhq,daiyu/gitlab-zh,axilleas/gitlabhq,darkrasid/gitlabhq,shinexiao/gitlabhq,jirutka/gitlabhq,daiyu/gitlab-zh,openwide-java/gitlabhq,daiyu/gitlab-zh,stoplightio/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,dplarson/gitlabhq,martijnvermaat/gitlabhq,larryli/gitlabhq,dplarson/gitlabhq,martijnvermaat/gitlabhq,t-zuehlsdorff/gitlabhq,LUMC/gitlabhq,openwide-java/gitlabhq,iiet/iiet-git,dreampet/gitlab,Soullivaneuh/gitlabhq,daiyu/gitlab-zh,screenpages/gitlabhq,larryli/gitlabhq,htve/GitlabForChinese,mmkassem/gitlabhq,openwide-java/gitlabhq,mr-dxdy/gitlabhq,screenpages/gitlabhq,SVArago/gitlabhq,allysonbarros/gitlabhq,mmkassem/gitlabhq,shinexiao/gitlabhq,allysonbarros/gitlabhq,allysonbarros/gitlabhq,dwrensha/gitlabhq,htve/GitlabForChinese,openwide-java/gitlabhq