Moving host status events monitoring to a separate interface (HostStatusMonitor).

remoting/host/curtaining_host_observer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/curtaining_host_observer.h"
 
 #include "base/logging.h"
 #include "remoting/host/curtain_mode.h"
-#include "remoting/host/chromoting_host.h"
+#include "remoting/host/host_status_monitor.h"
 
 namespace remoting {
 
 CurtainingHostObserver::CurtainingHostObserver(
-    CurtainMode *curtain, scoped_refptr<ChromotingHost> host)
-    : curtain_(curtain), host_(host) {
-  host_->AddStatusObserver(this);
+    CurtainMode *curtain, base::WeakPtr<HostStatusMonitor> monitor)
+    : curtain_(curtain), monitor_(monitor) {
+  monitor_->AddStatusObserver(this);
 }
 
 CurtainingHostObserver::~CurtainingHostObserver() {
-  host_->RemoveStatusObserver(this);
+  if (monitor_)
+    monitor_->RemoveStatusObserver(this);
   curtain_->SetActivated(false);
 }
 
 void CurtainingHostObserver::SetEnableCurtaining(bool enable) {
   enable_curtaining_ = enable;
   curtain_->SetActivated(enable_curtaining_ && !active_clients_.empty());
 }
 
 void CurtainingHostObserver::OnClientAuthenticated(const std::string& jid) {
   active_clients_.insert(jid);
   curtain_->SetActivated(enable_curtaining_ && !active_clients_.empty());
 }
 
 void CurtainingHostObserver::OnClientDisconnected(const std::string& jid) {
   active_clients_.erase(jid);
   curtain_->SetActivated(enable_curtaining_ && !active_clients_.empty());
 }
 
 }  // namespace remoting