Give DisconnectWindow some TLC.

remoting/host/disconnect_window_gtk.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/disconnect_window.h"
 
 #include <gtk/gtk.h>
 #include <math.h>
 
 #include "base/compiler_specific.h"
@@ skipping 38 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(DisconnectWindowGtk);
 };
 
 DisconnectWindowGtk::DisconnectWindowGtk()
     : disconnect_window_(NULL),
       current_width_(0),
       current_height_(0) {
 }
 
 DisconnectWindowGtk::~DisconnectWindowGtk() {
+  Hide();
 }
 
 void DisconnectWindowGtk::CreateWindow(const UiStrings& ui_strings) {
   if (disconnect_window_) return;
 
   disconnect_window_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
   GtkWindow* window = GTK_WINDOW(disconnect_window_);
 
   g_signal_connect(disconnect_window_, "delete-event",
                    G_CALLBACK(OnDeleteThunk), this);
@@ skipping 207 matching lines @@
                              event->y_root,
                              event->time);
   return FALSE;
 }
 
 scoped_ptr<DisconnectWindow> DisconnectWindow::Create() {
   return scoped_ptr<DisconnectWindow>(new DisconnectWindowGtk());
 }
 
 }  // namespace remoting