Suppress data races in libjingle_peerconnection_unittest

TBR=pbos@webrtc.org
BUG=4488
TESTED=Passing builds with:
out/Release/libjingle_peerconnection_unittest --gtest_filter=PeerConnectionInterfaceTest* --gtest_repeat=100 --gtest_break_on_failure
(reproduces without these suppressions)

Review URL: https://webrtc-codereview.appspot.com/50539004

Cr-Commit-Position: refs/heads/master@{#8886}
diff --git a/webrtc/build/sanitizers/tsan_suppressions_webrtc.cc b/webrtc/build/sanitizers/tsan_suppressions_webrtc.cc
index d6b24b5..da293ad 100644
--- a/webrtc/build/sanitizers/tsan_suppressions_webrtc.cc
+++ b/webrtc/build/sanitizers/tsan_suppressions_webrtc.cc
@@ -56,6 +56,11 @@
 "deadlock:rtc::MessageQueueManager::Clear\n"
 "deadlock:rtc::MessageQueueManager::ClearInternal\n"
 
+// libjingle_peerconnection_unittest
+// https://code.google.com/p/webrtc/issues/detail?id=4488
+"race:webrtc::voe::ChannelOwner::~ChannelOwner\n"
+"race:cricket::ChannelManager::Terminate_w()\n"
+
 // libjingle_p2p_unittest
 // https://code.google.com/p/webrtc/issues/detail?id=2079
 "race:webrtc/base/testclient.cc\n"