Revert "Ensure that ExchangeService.done() is called when exiting"

* The CL to be reverted caused 5267949; a different solution will
  be attempted in a future CL

This reverts commit e92b160eedb90114200be19689abf94c06b5ac8c.

Change-Id: I3d4fdf6fc210c626b7dc50b1ba250870a04eed96
1 file changed