Revert "Disable some PortAllocatorTest on tsan due to flakiness"

This reverts commit 491bd534ef726456883ec372562d1c8fef82e7ca.

TBR=kjellander@webrtc.org
BUG=4743

Review URL: https://codereview.webrtc.org/1157743008

Cr-Commit-Position: refs/heads/master@{#9375}
1 file changed