Increase STUN RTOs

webrtc/p2p/base/stunrequest.h

Index: webrtc/p2p/base/stunrequest.h
diff --git a/webrtc/p2p/base/stunrequest.h b/webrtc/p2p/base/stunrequest.h
index f6d216d1f714eca780f8d9b3574f616509bbc482..99dff14aee9bd7df00ffd4c8a8e0a383f40911de 100644
--- a/webrtc/p2p/base/stunrequest.h
+++ b/webrtc/p2p/base/stunrequest.h
@@ -23,6 +23,11 @@ class StunRequest;
 
 const int kAllRequests = 0;
 
+// Total max timeouts: 39.75 seconds
+// For years, this was 9.5 seconds, but for networks that experience moments of
+// high RTT (such as 40s on 2G networks), this doesn't work well.
+const int STUN_TOTAL_TIMEOUT = 39750;  // milliseconds
+
 // Manages a set of STUN requests, sending and resending until we receive a
 // response or determine that the request has timed out.
 class StunRequestManager {