Properly handle STUN requests and responses from relay servers.

content/browser/renderer_host/p2p/socket_host_udp.cc

Index: content/browser/renderer_host/p2p/socket_host_udp.cc
diff --git a/content/browser/renderer_host/p2p/socket_host_udp.cc b/content/browser/renderer_host/p2p/socket_host_udp.cc
index 8fae6ff10ef48c38182a4fb222251b3ed525d23b..a606ebcb0ea8d436fc002a4cd0a5e7d6d22e8847 100644
--- a/content/browser/renderer_host/p2p/socket_host_udp.cc
+++ b/content/browser/renderer_host/p2p/socket_host_udp.cc
@@ -100,8 +100,7 @@ void P2PSocketHostUdp::DidCompleteRead(int result) {
     if (authorized_peers_.find(recv_address_) == authorized_peers_.end()) {
       P2PSocketHost::StunMessageType type;
       bool stun = GetStunPacketType(&*data.begin(), data.size(), &type);
-      if (stun && (type == STUN_BINDING_REQUEST ||
-                   type == STUN_BINDING_RESPONSE)) {
+      if (stun && IsRequestOrResponse(type)) {
         authorized_peers_.insert(recv_address_);
       } else if (!stun || type == STUN_DATA_INDICATION) {
         LOG(ERROR) << "Received unexpected data packet from "