[Chromoting] Make ChromotingHost's dependency on libjingle injected, instead of hard-coded.

remoting/host/plugin/host_script_object.cc

Index: remoting/host/plugin/host_script_object.cc
diff --git a/remoting/host/plugin/host_script_object.cc b/remoting/host/plugin/host_script_object.cc
index 91587520b453f7a6749128615c14a4faee1fd144..d36e72c4c9877c9b409c30f663e8c4b864b618c0 100644
--- a/remoting/host/plugin/host_script_object.cc
+++ b/remoting/host/plugin/host_script_object.cc
@@ -22,6 +22,7 @@
 #include "remoting/host/host_key_pair.h"
 #include "remoting/host/host_secret.h"
 #include "remoting/host/it2me_host_user_interface.h"
+#include "remoting/host/jingle_session_manager_factory.h"
 #include "remoting/host/pin_hash.h"
 #include "remoting/host/plugin/daemon_controller.h"
 #include "remoting/host/plugin/host_log_handler.h"
@@ -557,6 +558,7 @@ void HostNPScriptObject::FinishConnectNetworkThread(
   LOG(INFO) << "NAT state: " << nat_traversal_enabled_;
   host_ = new ChromotingHost(
       host_context_.get(), signal_strategy_.get(), desktop_environment_.get(),
+      scoped_ptr<SessionManagerFactory>(new JingleSessionManagerFactory()),
       NetworkSettings(nat_traversal_enabled_ ?
                       NetworkSettings::NAT_TRAVERSAL_ENABLED :
                       NetworkSettings::NAT_TRAVERSAL_DISABLED));