Remove unused method
Remove unused method

The rate limit check in the job was removed in #729.

alphagov/e-petitions,alphagov/e-petitions,alphagov/e-petitions,joelanman/e-petitions,joelanman/e-petitions,unboxed/e-petitions,unboxed/e-petitions,alphagov/e-petitions,unboxed/e-petitions,unboxed/e-petitions,joelanman/e-petitions