Set incoming_only flag on the host side when NAT traversal is disabled.

remoting/protocol/session_manager.h

Index: remoting/protocol/session_manager.h
diff --git a/remoting/protocol/session_manager.h b/remoting/protocol/session_manager.h
index 1f6323e7b272251d9b44a7f4ba365ede0988da70..cac11f0b936d1dd2136ae04b2b339c2cd95bac49 100644
--- a/remoting/protocol/session_manager.h
+++ b/remoting/protocol/session_manager.h
@@ -59,6 +59,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/threading/non_thread_safe.h"
 #include "remoting/protocol/session.h"
+#include "remoting/protocol/transport_config.h"
 
 namespace remoting {
 
@@ -72,18 +73,25 @@ class AuthenticatorFactory;
 // TODO(sergeyu): Remove this struct and use TransportConfig instead.
 struct NetworkSettings {
   NetworkSettings()
-      : allow_nat_traversal(false),
+      : nat_traversal_mode(TransportConfig::NAT_TRAVERSAL_DISABLED),
+        max_port(0) {
+  }
+
+  explicit NetworkSettings(bool allow_nat_traversal)
+      : nat_traversal_mode(allow_nat_traversal ?
+                           TransportConfig::NAT_TRAVERSAL_ENABLED :
+                           TransportConfig::NAT_TRAVERSAL_DISABLED),
         min_port(0),
         max_port(0) {
   }
 
-  explicit NetworkSettings(bool allow_nat_traversal_value)
-      : allow_nat_traversal(allow_nat_traversal_value),
+  explicit NetworkSettings(TransportConfig::NatTraversalMode nat_traversal_mode)
+      : nat_traversal_mode(nat_traversal_mode),
         min_port(0),
         max_port(0) {
   }
 
-  bool allow_nat_traversal;
+  TransportConfig::NatTraversalMode nat_traversal_mode;
 
   // |min_port| and |max_port| specify range (inclusive) of ports used by
   // P2P sessions. Any port can be used when both values are set to 0.