Prevent outofbounds exception when logging.

- Use foreach loop instead, which, with a CopyOnWriteArrayList, will
  prevent arrayindexoutofbounds exception, so we no longer need this in
the synchronised block.

Bug: 378672602
Flag: EXEMPT small bug fix only
Test: manual
Change-Id: I825afe2d5b479ad5e60de996b112a24b3303fc33