Revert "Remove the unnecessary lock from TcpSocketTracker"

This reverts commit cf92d61053493e68516270651de9dddb7ba2e901.

Reason for revert: Suspected culprit for b/349178621
(cherry picked from https://android-review.googlesource.com/q/commit:885ef2f2a4bbdbfa99bbfdaba975d0cf2e65d1f2)
Merged-In: Ia89cc08f9fe2abadfc527cdc05c989ccc0efc64f
Change-Id: Ia89cc08f9fe2abadfc527cdc05c989ccc0efc64f
4 files changed