Address comments and final cleanup from refcounting integration

Added some extra comments on reference counting and moved a few methods
around. No significant logical changes made in this CL

Bug: 63409385
Test: CTS, Unit tests (both frameworks-base and netd) and binder tests
all pass

Change-Id: I89f1f4a021db48ae406fefefa6aca7406045736c
1 file changed
tree: cdd4fea9014397df440d4f67fae56d5a6892fe16
  1. core/
  2. services/
  3. tests/