Fixing and re-enabling some flaky PeerConnection tests.

talk/app/webrtc/peerconnectionendtoend_unittest.cc

Index: talk/app/webrtc/peerconnectionendtoend_unittest.cc
diff --git a/talk/app/webrtc/peerconnectionendtoend_unittest.cc b/talk/app/webrtc/peerconnectionendtoend_unittest.cc
index 1d7bb9211eb098f26dd819c6d28eaa7b7337ebf7..6e506345ba260190ad6ca81401356508690285d9 100644
--- a/talk/app/webrtc/peerconnectionendtoend_unittest.cc
+++ b/talk/app/webrtc/peerconnectionendtoend_unittest.cc
@@ -230,8 +230,7 @@ TEST_F(PeerConnectionEndToEndTest, Call) {
 }
 #endif // if !defined(THREAD_SANITIZER) && !defined(WEBRTC_MAC)
 
-// Disabled per b/14899892
-TEST_F(PeerConnectionEndToEndTest, DISABLED_CallWithLegacySdp) {
+TEST_F(PeerConnectionEndToEndTest, CallWithLegacySdp) {
   FakeConstraints pc_constraints;
   pc_constraints.AddMandatory(MediaConstraintsInterface::kEnableDtlsSrtp,
                               false);