Disable flaky WebRtcMediumTest.GetMessenger_StartAndStopReceivingMessages

Bug: 1146543
Change-Id: Ibdc22d9244779fc2318121ab8910d7984453eb4d
NoTry: True
Tbr: vecore@google.com
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523537Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824988}

chrome/services/sharing/nearby/platform/webrtc_test.cc

@@ -160,7 +160,8 @@ TEST_F(WebRtcMediumTest, GetMessengerAndStartReceivingMessages) {
   loop.Run();
 }
 
-TEST_F(WebRtcMediumTest, GetMessenger_StartAndStopReceivingMessages) {
+// TODO(crbug.com/1146543): Test is flaky.
+TEST_F(WebRtcMediumTest, DISABLED_GetMessenger_StartAndStopReceivingMessages) {
   ByteArray message("message");
   const std::string from = "from";