Remove unused initializer
Remove unused initializer

We don't appear to have an `active_record_query_trace` dependency any more.

dplarson/gitlabhq,stoplightio/gitlabhq,htve/GitlabForChinese,dreampet/gitlab,t-zuehlsdorff/gitlabhq,htve/GitlabForChinese,dreampet/gitlab,iiet/iiet-git,iiet/iiet-git,iiet/iiet-git,axilleas/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,stoplightio/gitlabhq,dplarson/gitlabhq,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,stoplightio/gitlabhq,dplarson/gitlabhq,htve/GitlabForChinese,iiet/iiet-git,jirutka/gitlabhq,jirutka/gitlabhq,axilleas/gitlabhq,mmkassem/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,stoplightio/gitlabhq,dplarson/gitlabhq,t-zuehlsdorff/gitlabhq,htve/GitlabForChinese,dreampet/gitlab,t-zuehlsdorff/gitlabhq,jirutka/gitlabhq,mmkassem/gitlabhq