Disable RampUpTest.UpDownUp* in webrtc_perf_tests on Mac

NOTRY=True
BUG=5407
TBR=stefan@webrtc.org,pbos@webrtc.org

Review URL: https://codereview.webrtc.org/1569273003

Cr-Commit-Position: refs/heads/master@{#11188}
diff --git a/webrtc/call/rampup_tests.cc b/webrtc/call/rampup_tests.cc
index 44b7ef2..9b31901 100644
--- a/webrtc/call/rampup_tests.cc
+++ b/webrtc/call/rampup_tests.cc
@@ -414,6 +414,9 @@
   RunBaseTest(&test);
 }
 
+// Disabled on Mac due to flakiness, see
+// https://bugs.chromium.org/p/webrtc/issues/detail?id=5407
+#ifndef WEBRTC_MAC
 TEST_F(RampUpTest, UpDownUpOneStream) {
   RampUpDownUpTester test(1, 60000, RtpExtension::kAbsSendTime, false, false);
   RunBaseTest(&test);
@@ -443,6 +446,7 @@
   RampUpDownUpTester test(3, 60000, RtpExtension::kAbsSendTime, true, true);
   RunBaseTest(&test);
 }
+#endif
 
 TEST_F(RampUpTest, AbsSendTimeSingleStream) {
   RampUpTester test(1, 0, 0, RtpExtension::kAbsSendTime, false, false);