Ensure that ExchangeService.done() is called when exiting

* Failure to do this can cause the service's wake lock to be held
  inappropriately, leading to battery life issues
* Currently, this appears to be seen only in modded OS's, but it
  might well be appearing on a wider scale.

Bug: 5256268
Change-Id: I02852d2c645d6c38e3813a398a52a04ca2e5d07d
1 file changed