Destroy the TaskManagerGtk singleton instance when its window is destroyed, o...

chrome/browser/gtk/task_manager_gtk.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_BROWSER_GTK_TASK_MANAGER_GTK_H_
 #define CHROME_BROWSER_GTK_TASK_MANAGER_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include <string>
@@ skipping 51 matching lines @@
   // Activates the tab associated with the focused row.
   void ActivateFocusedTab();
 
   // Opens about:memory in a new foreground tab.
   void OnLinkActivated();
 
   // Compare implementation used for sorting columns.
   gint CompareImpl(GtkTreeModel* tree_model, GtkTreeIter* a,
                    GtkTreeIter* b, int id);
 
+  // response signal handler that notifies us of dialog destruction.
+  static void OnDestroy(GtkDialog* dialog, TaskManagerGtk* task_manager);
+
   // response signal handler that notifies us of dialog responses.
   static void OnResponse(GtkDialog* dialog, gint response_id,
                          TaskManagerGtk* task_manager);
 
   // realize signal handler to set the page column's initial size.
   static void OnTreeViewRealize(GtkTreeView* treeview,
                                 TaskManagerGtk* task_manager);
 
   // changed signal handler that is sent when the treeview selection changes.
   static void OnSelectionChanged(GtkTreeSelection* selection,
@@ skipping 104 matching lines @@
   // The treeview that contains the process list.
   GtkWidget* treeview_;
 
   // The list of processes.
   GtkListStore* process_list_;
   GtkTreeModel* process_list_sort_;
 
   // The number of processes in |process_list_|.
   int process_count_;
 
+  // The id of the |dialog_| destroy signal handler.
+  gulong destroy_handler_id_;
+
   // The context menu controller.
   scoped_ptr<ContextMenuController> menu_controller_;
 
   GtkAccelGroup* accel_group_;
 
   // An open task manager window. There can only be one open at a time. This
   // is reset to NULL when the window is closed.
   static TaskManagerGtk* instance_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_TASK_MANAGER_GTK_H_