Fix a flaky turnport test failure
Fix a flaky turnport test failure

The connection was deleted asynchronously, so need to use EXPECT_TRUE_WAIT.

BUG=
TBR=pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1567433002 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#11153}

TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc