Log client IP addresses to syslog in Me2Me host.

remoting/host/it2me_host_user_interface.cc

Index: remoting/host/it2me_host_user_interface.cc
diff --git a/remoting/host/it2me_host_user_interface.cc b/remoting/host/it2me_host_user_interface.cc
index dbde578b779df585e3f0271c05122d66058c0ff9..99b031e6caa878cb016e9e56e5ad56322c69a18a 100644
--- a/remoting/host/it2me_host_user_interface.cc
+++ b/remoting/host/it2me_host_user_interface.cc
@@ -83,6 +83,11 @@ void It2MeHostUserInterface::OnClientDisconnected(const std::string& jid) {
 void It2MeHostUserInterface::OnAccessDenied(const std::string& jid) {
 }
 
+void It2MeHostUserInterface::OnClientIpAddress(
+    const std::string& jid, const std::string& channel_name,
+    const net::IPEndPoint& end_point) {
+}
+
 void It2MeHostUserInterface::OnShutdown() {
   // Host status observers must be removed on the network thread, so
   // it must happen here instead of in the destructor.