Enable TURN on the host when using WebRTC.

remoting/host/chromoting_host.cc

Index: remoting/host/chromoting_host.cc
diff --git a/remoting/host/chromoting_host.cc b/remoting/host/chromoting_host.cc
index 81ccacfb849e018c012a98cb08a03f045982a563..440004a5902463615860c3751521249c7c10c842 100644
--- a/remoting/host/chromoting_host.cc
+++ b/remoting/host/chromoting_host.cc
@@ -66,12 +66,14 @@ const net::BackoffEntry::Policy kDefaultBackoffPolicy = {
 ChromotingHost::ChromotingHost(
     DesktopEnvironmentFactory* desktop_environment_factory,
     scoped_ptr<protocol::SessionManager> session_manager,
-    scoped_refptr<protocol::TransportContext> transport_context,
+    scoped_refptr<protocol::TransportContext> ice_transport_context,
+    scoped_refptr<protocol::TransportContext> webrtc_transport_context,
     scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> video_encode_task_runner)
     : desktop_environment_factory_(desktop_environment_factory),
       session_manager_(std::move(session_manager)),
-      transport_context_(transport_context),
+      ice_transport_context_(ice_transport_context),
+      webrtc_transport_context_(webrtc_transport_context),
       audio_task_runner_(audio_task_runner),
       video_encode_task_runner_(video_encode_task_runner),
       started_(false),
@@ -267,10 +269,10 @@ void ChromotingHost::OnIncomingSession(
   if (session->config().protocol() ==
       protocol::SessionConfig::Protocol::WEBRTC) {
     connection.reset(new protocol::WebrtcConnectionToClient(
-        make_scoped_ptr(session), transport_context_));
+        make_scoped_ptr(session), webrtc_transport_context_));
   } else {
     connection.reset(new protocol::IceConnectionToClient(
-        make_scoped_ptr(session), transport_context_,
+        make_scoped_ptr(session), ice_transport_context_,
         video_encode_task_runner_));
   }