Remove unnecessary method - handled by FreeTrialModalController

services/web/public/coffee/ide/review-panel/controllers/TrackChangesUpgradeModalController.coffee

@@ -4,8 +4,3 @@ define [
 	App.controller "TrackChangesUpgradeModalController", ($scope, $modalInstance) ->
 		$scope.cancel = () ->
 			$modalInstance.dismiss()
-			
-		$scope.startFreeTrial = (source) ->
-			ga?('send', 'event', 'subscription-funnel', 'upgraded-free-trial', source)
-			window.open("/user/subscription/new?planCode=student_free_trial_7_days")
-			$scope.startedFreeTrial = true