Pass the |curtain_activated| flag to IpcDesktopEnvironmentFactory.

remoting/host/remoting_me2me_host.cc

Index: remoting/host/remoting_me2me_host.cc
diff --git a/remoting/host/remoting_me2me_host.cc b/remoting/host/remoting_me2me_host.cc
index 2d1a3b7c249dca496079ae9f3e490cd25bbac52f..abd0cd03e9d118a255535cb12e51c40a99a02940 100644
--- a/remoting/host/remoting_me2me_host.cc
+++ b/remoting/host/remoting_me2me_host.cc
@@ -943,10 +943,18 @@ void HostProcess::StartHost() {
   resizing_host_observer_.reset(
       new ResizingHostObserver(desktop_resizer_.get(), host_->AsWeakPtr()));
 
+#if defined(REMOTING_RDP_SESSION)
+  // TODO(alexeypa): do not create |curtain_| in this case.
+  CurtainMode* curtain = static_cast<IpcDesktopEnvironmentFactory*>(
+      desktop_environment_factory_.get());
+#else  // !defined(REMOTING_RDP_SESSION)
+  CurtainMode* curtain = curtain_.get();
+#endif  // !defined(REMOTING_RDP_SESSION)
+
   // Create a host observer to enable/disable curtain mode as clients connect
   // and disconnect.
   curtaining_host_observer_.reset(new CurtainingHostObserver(
-                                  curtain_.get(), host_->AsWeakPtr()));
+      curtain, host_->AsWeakPtr()));
   curtaining_host_observer_->SetEnableCurtaining(curtain_required_);
 
   if (host_user_interface_.get()) {