Removing unused function

lib/gitlab/diff/line.rb

@@ -63,10 +63,6 @@ module Gitlab
         @text&.slice(1..).to_s
       end
 
-      def line_based_on_type
-        type == "old" ? old_line : new_line
-      end
-
       def old_line
         old_pos unless added? || meta?
       end