Stop sending stun binding requests after certain amount of time.

webrtc/p2p/base/stunport.cc

Index: webrtc/p2p/base/stunport.cc
diff --git a/webrtc/p2p/base/stunport.cc b/webrtc/p2p/base/stunport.cc
index 13ecca4a3a1cb90b2640e45ebee708d47cc2bf37..db8e8dfb273b81c3b3417c93619c75f35cd1e75a 100644
--- a/webrtc/p2p/base/stunport.cc
+++ b/webrtc/p2p/base/stunport.cc
@@ -397,7 +397,7 @@ void UDPPort::SendStunBindingRequest(const rtc::SocketAddress& stun_addr) {
   } else if (socket_->GetState() == rtc::AsyncPacketSocket::STATE_BOUND) {
     // Check if |server_addr_| is compatible with the port's ip.
     if (IsCompatibleAddress(stun_addr)) {
-      requests_.Send(new StunBindingRequest(this, true, stun_addr));
+      requests_.Send(new StunBindingRequest(this, false, stun_addr));

[pthatcher1, 2015/12/02 22:38:08]

Can we change StunBindingRequest::keep_alive_ to
StunBindingRequest::keep_alive_deadline_?  It looks like it would be pretty
easy, and then we could pass in something like 2 minutes here.  

[honghaiz3, 2015/12/03 01:00:01]

Done.

     } else {
       // Since we can't send stun messages to the server, we should mark this
       // port ready.