Create an experiment to study whether too many bindings cause NAT failure

content/renderer/media/webrtc/peer_connection_dependency_factory.cc

Index: content/renderer/media/webrtc/peer_connection_dependency_factory.cc
diff --git a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
index 34a949b750d9181e6f154e2032cf1fef8db721cb..1f474948d0c25d7752e454764b83f6739bf78977 100644
--- a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
+++ b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
@@ -205,6 +205,11 @@ PeerConnectionDependencyFactory::PeerConnectionDependencyFactory(
 PeerConnectionDependencyFactory::~PeerConnectionDependencyFactory() {
   DVLOG(1) << "~PeerConnectionDependencyFactory()";
   DCHECK(pc_factory_ == NULL);
+
+  for (auto prober : stun_probers_) {
+    if (prober)
+      delete prober;
+  }
 }
 
 blink::WebRTCPeerConnectionHandler*
@@ -685,7 +690,7 @@ void PeerConnectionDependencyFactory::StartStunProbeTrialOnWorkerThread(
   DCHECK(chrome_worker_thread_.task_runner()->BelongsToCurrentThread());
   rtc::NetworkManager::NetworkList networks;
   network_manager_->GetNetworks(&networks);
-  stun_prober_ = StartStunProbeTrial(networks, params, socket_factory_.get());
+  StartStunProbeTrial(networks, params, socket_factory_.get(), &stun_probers_);
 }
 
 void PeerConnectionDependencyFactory::CreateIpcNetworkManagerOnWorkerThread(