From the WHL website

a) In the event two Clubs finish tied in total points in WHL standings, the edge goes to the Club with the most victories. If that is a tie, it will go to the Club with the most points in games between the two Clubs during the regular schedule. If the two Clubs are still even, the edge goes to the Club with the highest ratio when taking goals for and subtracting goals against in regular season play. If it is still a tie, the edge will go to the Club with the highest ratio when taking goals for and subtracting goals against in games played between the two Clubs in regular schedule play.