Add synchronized to toString.

If toString is called at the same time removeWaitingApn we can
get a ConncurrentModificationException.

Bug: 8727610
Change-Id: I95c2181a1a5abc1a28a9e4eb337b674e49847103
1 file changed
tree: 784c20b549ad89ca68ebf230c4f0608aefcbb27c
  1. src/
  2. tests/
  3. tools/
  4. Android.mk
  5. CleanSpec.mk
  6. README.txt