Create a new preference which disables UDP protocol for WebRTC

content/renderer/p2p/port_allocator.cc

Index: content/renderer/p2p/port_allocator.cc
diff --git a/content/renderer/p2p/port_allocator.cc b/content/renderer/p2p/port_allocator.cc
index 7a1abdc216648d18b693d50dd36db484bfb13348..92edf524fb6ff837dd2b8259b767b9aea0bc76a5 100644
--- a/content/renderer/p2p/port_allocator.cc
+++ b/content/renderer/p2p/port_allocator.cc
@@ -39,6 +39,11 @@ P2PPortAllocator::P2PPortAllocator(
     flags |= cricket::PORTALLOCATOR_DISABLE_TCP;
   if (!config_.enable_multiple_routes)
     flags |= cricket::PORTALLOCATOR_DISABLE_ADAPTER_ENUMERATION;
+  if (config_.disable_udp_transport) {
+    flags |= cricket::PORTALLOCATOR_DISABLE_UDP |
+             cricket::PORTALLOCATOR_DISABLE_STUN |
+             cricket::PORTALLOCATOR_DISABLE_TURN_OVER_UDP;
+  }
   set_flags(flags);
   set_allow_tcp_listen(false);
   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();