Disable flaky test WebRtcSessionTest.TestRtxRemovedByCreateAnswer on Win and Mac.

talk/app/webrtc/webrtcsession_unittest.cc

 /*
  * libjingle
  * Copyright 2012 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 4172 matching lines @@
   cricket::Candidate candidate1;
   candidate1.set_address(rtc::SocketAddress("1.1.1.1", 5000));
   candidate1.set_component(1);
   JsepIceCandidate ice_candidate(kMediaContentName1, kMediaContentIndex1,
                                  candidate1);
   EXPECT_TRUE(session_->ProcessIceMessage(&ice_candidate));
 
   answer = CreateAnswer(NULL);
   SetLocalDescriptionWithoutError(answer);
 }
+
+// Flaky on Win and Mac only. See webrtc:4943
+#if defined(WEBRTC_WIN) || defined(WEBRTC_MAC)
+#define MAYBE_TestRtxRemovedByCreateAnswer DISABLED_TestRtxRemovedByCreateAnswer
+#else
+#define MAYBE_TestRtxRemovedByCreateAnswer TestRtxRemovedByCreateAnswer
+#endif
 // Tests that RTX codec is removed from the answer when it isn't supported
 // by local side.
-TEST_F(WebRtcSessionTest, TestRtxRemovedByCreateAnswer) {
+TEST_F(WebRtcSessionTest, MAYBE_TestRtxRemovedByCreateAnswer) {
   Init();
   SendAudioVideoStream1();
   std::string offer_sdp(kSdpWithRtx);
 
   SessionDescriptionInterface* offer =
       CreateSessionDescription(JsepSessionDescription::kOffer, offer_sdp, NULL);
   EXPECT_TRUE(offer->ToString(&offer_sdp));
 
   // Offer SDP contains the RTX codec.
   EXPECT_TRUE(offer_sdp.find("rtx") != std::string::npos);
@@ skipping 97 matching lines @@
 }
 
 // TODO(bemasc): Add a TestIceStatesBundle with BUNDLE enabled.  That test
 // currently fails because upon disconnection and reconnection OnIceComplete is
 // called more than once without returning to IceGatheringGathering.
 
 INSTANTIATE_TEST_CASE_P(WebRtcSessionTests,
                         WebRtcSessionTest,
                         testing::Values(ALREADY_GENERATED,
                                         DTLS_IDENTITY_STORE));