message: Remove irrelevant function
diff: @@ -56,11 +56,6 @@ describe('RoomList', () => {
  DMRoomMap.makeShared();
  - // Lie to the room list store about DMs not existing
  - DMRoomMap.getUserIdForRoomId = () => {
  - return null;
  - };
  -
  parentDiv = document.createElement('div');
  document.body.appendChild(parentDiv);
  