Delete newLintAtLine()
Delete newLintAtLine()

Summary: Nobody needs it because `raiseLintAtLine()` returns the message.

Test Plan:
  $ arc unit

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4870

chundongwang/arcanist,alexmv/arcanist,wharris/arcanist,codelabs-ch/arcanist,aik099/arcanist,uber/arcanist,PageUpPeopleOrg/arcanist-patches,alexmv/arcanist,uber/arcanist,codelabs-ch/arcanist,phacility/arcanist,r4nt/arcanist,uber/arcanist,wikimedia/phabricator-arcanist,jra3/arcanist,sneakpeeq/arcanist,wharris/arcanist,hach-que/arcanist,memsql/arcanist,Khan/arcanist,sneakpeeq/arcanist,r4nt/arcanist,eSpark/arcanist,Khan/arcanist,folsom-labs/arcanist,wikimedia/phabricator-arcanist,zhihu/arcanist,chundongwang/arcanist,kevinseelbach/arcanist,codelabs-ch/arcanist,phacility/arcanist,fivestars/arcanist,folsom-labs/arcanist,eSpark/arcanist,coursera/arcanist,chundongwang/arcanist,dguo-coursera/arcanist,wharris/arcanist,memsql/arcanist,zhihu/arcanist,phacility/arcanist,sneakpeeq/arcanist,wxstars/arcanist,Symplicity/arcanist,jra3/arcanist,Symplicity/arcanist,dguo-coursera/arcanist,julkiewicz/arcanist,calblueprint/arcanist,fivestars/arcanist,PageUpPeopleOrg/arcanist-patches,eSpark/arcanist,sneakpeeq/arcanist,r4nt/arcanist,fivestars/arcanist,uber/arcanist,aik099/arcanist,julkiewicz/arcanist,Symplicity/arcanist,fivestars/arcanist,calblueprint/arcanist,dguo-coursera/arcanist,zhihu/arcanist,haskell-infra/arcanist,jra3/arcanist,calblueprint/arcanist,kevinseelbach/arcanist,KieranHayes/arcanist,aik099/arcanist,haskell-infra/arcanist,codelabs-ch/arcanist,folsom-labs/arcanist,KieranHayes/arcanist,folsom-labs/arcanist,eSpark/arcanist,alexmv/arcanist,memsql/arcanist,wikimedia/phabricator-arcanist,julkiewicz/arcanist,haskell-infra/arcanist,wharris/arcanist,PageUpPeopleOrg/arcanist-patches,memsql/arcanist,kevinseelbach/arcanist,jra3/arcanist,calblueprint/arcanist,KieranHayes/arcanist,Symplicity/arcanist,PageUpPeopleOrg/arcanist-patches,hach-que/arcanist,kevinseelbach/arcanist,zhihu/arcanist,wikimedia/phabricator-arcanist,phacility/arcanist,codelabs-ch/arcanist,hach-que/arcanist,r4nt/arcanist,chundongwang/arcanist,wxstars/arcanist,hach-que/arcanist,wxstars/arcanist,KieranHayes/arcanist,coursera/arcanist,phacility/arcanist,coursera/arcanist,coursera/arcanist,julkiewicz/arcanist,Khan/arcanist,haskell-infra/arcanist,alexmv/arcanist,Khan/arcanist,wxstars/arcanist,aik099/arcanist,dguo-coursera/arcanist