Remove some unused methods from ArcanistLinter
Remove some unused methods from ArcanistLinter

Summary: These methods are unused.

Test Plan: N/A

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D14065

r4nt/arcanist,memsql/arcanist,calblueprint/arcanist,codelabs-ch/arcanist,codelabs-ch/arcanist,Khan/arcanist,folsom-labs/arcanist,jra3/arcanist,r4nt/arcanist,alexmv/arcanist,r4nt/arcanist,r4nt/arcanist,phacility/arcanist,fivestars/arcanist,uber/arcanist,uber/arcanist,calblueprint/arcanist,aik099/arcanist,uber/arcanist,phacility/arcanist,Khan/arcanist,memsql/arcanist,wikimedia/phabricator-arcanist,coursera/arcanist,calblueprint/arcanist,phacility/arcanist,alexmv/arcanist,Khan/arcanist,Khan/arcanist,folsom-labs/arcanist,zhihu/arcanist,memsql/arcanist,uber/arcanist,chundongwang/arcanist,zhihu/arcanist,fivestars/arcanist,phacility/arcanist,aik099/arcanist,aik099/arcanist,codelabs-ch/arcanist,kevinseelbach/arcanist,wikimedia/phabricator-arcanist,fivestars/arcanist,fivestars/arcanist,kevinseelbach/arcanist,jra3/arcanist,jra3/arcanist,chundongwang/arcanist,memsql/arcanist,phacility/arcanist,kevinseelbach/arcanist,coursera/arcanist,aik099/arcanist,haskell-infra/arcanist,wikimedia/phabricator-arcanist,coursera/arcanist,haskell-infra/arcanist,alexmv/arcanist,kevinseelbach/arcanist,haskell-infra/arcanist,folsom-labs/arcanist,wikimedia/phabricator-arcanist,haskell-infra/arcanist,chundongwang/arcanist,alexmv/arcanist,codelabs-ch/arcanist,coursera/arcanist,chundongwang/arcanist,calblueprint/arcanist,jra3/arcanist,folsom-labs/arcanist,zhihu/arcanist,codelabs-ch/arcanist,zhihu/arcanist