Fix a flaky turnport test failure

webrtc/p2p/base/turnport_unittest.cc

Index: webrtc/p2p/base/turnport_unittest.cc
diff --git a/webrtc/p2p/base/turnport_unittest.cc b/webrtc/p2p/base/turnport_unittest.cc
index d0dc4871683660f30c742ac9421bf3e7a91eeb9f..916162575fee803093aff79ea89afde02cae5902 100644
--- a/webrtc/p2p/base/turnport_unittest.cc
+++ b/webrtc/p2p/base/turnport_unittest.cc
@@ -709,7 +709,7 @@ TEST_F(TurnPortTest, TestRefreshRequestGetsErrorResponse) {
   turn_port_->FlushRequests(cricket::TURN_REFRESH_REQUEST);
   EXPECT_TRUE_WAIT(!turn_refresh_success_, kTimeout);
   EXPECT_TRUE_WAIT(!turn_port_->connected(), kTimeout);
-  EXPECT_TRUE(turn_port_->connections().empty());
+  EXPECT_TRUE_WAIT(turn_port_->connections().empty(), kTimeout);
   EXPECT_FALSE(turn_port_->HasRequests());
 }