Made DesktopEnvironment responsible for creation of the disconnect window.

remoting/host/host_user_interface.h

Index: remoting/host/host_user_interface.h
diff --git a/remoting/host/host_user_interface.h b/remoting/host/host_user_interface.h
index 88adc458abbd5412bffb7bdd9cb64590e7e8e71a..8f0cf00b605e5014368025c7eeb04cb0396f168b 100644
--- a/remoting/host/host_user_interface.h
+++ b/remoting/host/host_user_interface.h
@@ -23,7 +23,6 @@ class SingleThreadTaskRunner;
 namespace remoting {
 
 class ChromotingHost;
-class DisconnectWindow;
 
 class HostUserInterface : public HostStatusObserver {
  public:
@@ -73,9 +72,6 @@ class HostUserInterface : public HostStatusObserver {
   // Used to ask the host to disconnect the session.
   base::Closure disconnect_callback_;
 
-  // Provide a user interface allowing the host user to close the connection.
-  scoped_ptr<DisconnectWindow> disconnect_window_;
-
  private:
   // Invoked from the UI thread when the user clicks on the Disconnect button
   // to disconnect the session.