Disable some PortAllocatorTest on tsan due to flakiness

TBR=kjellander@webrtc.org
BUG=4743

Review URL: https://codereview.webrtc.org/1160033005

Cr-Commit-Position: refs/heads/master@{#9369}

webrtc/p2p/client/portallocator_unittest.cc

@@ -472,6 +472,10 @@ TEST_F(PortAllocatorTest, TestDisableAdapterEnumerationMultipleInterfaces) {
   CheckDisableAdapterEnumeration();
 }
 
+// Disable for TSan v2, see
+// https://code.google.com/p/webrtc/issues/detail?id=4743 for details.
+#if !defined(THREAD_SANITIZER)
+
 // Test that we can get OnCandidatesAllocationDone callback when all the ports
 // are disabled.
 TEST_F(PortAllocatorTest, TestDisableAllPorts) {
@@ -509,6 +513,8 @@ TEST_F(PortAllocatorTest, TestGetAllPortsNoUdpSockets) {
   EXPECT_TRUE(candidate_allocation_done_);
 }
 
+#endif // if !defined(THREAD_SANITIZER)
+
 // Test that we don't crash or malfunction if we can't create UDP sockets or
 // listen on TCP sockets. We still give out a local TCP address, since
 // apparently this is needed for the remote side to accept our connection.