[PT03] Move some more code into ProxyTracker.

Add finals and annotations. Remove comments that have lost their
context (they were in the context of disabling a permission check
that had been added, but constituted an API change that would not
serve any real purpose).

Test: runtest
Change-Id: I1f879b2c105d2127072b88233d72097a0d78fe14
2 files changed