Disable P2PTransportChannelMultihomedTest.TestFailover under Memcheck

BUG=3447
R=kjellander@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/15689004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6327 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/tools/valgrind-webrtc/gtest_exclude/libjingle_p2p_unittest.gtest-memcheck.txt b/tools/valgrind-webrtc/gtest_exclude/libjingle_p2p_unittest.gtest-memcheck.txt
index 1ecdbfc..1e23329 100644
--- a/tools/valgrind-webrtc/gtest_exclude/libjingle_p2p_unittest.gtest-memcheck.txt
+++ b/tools/valgrind-webrtc/gtest_exclude/libjingle_p2p_unittest.gtest-memcheck.txt
@@ -3,4 +3,5 @@
 P2PTransportChannelSameNatTest.TestConesBehindSameCone
 PortTest.TestSendStunMessageAsIce
 PseudoTcpTest.TestSendBothUseLargeWindowScale
-
+# Issue 3447
+P2PTransportChannelMultihomedTest.TestFailover