Move application lifetime functionality off BrowserList.

chrome/browser/ui/browser_list_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 "chrome/browser/ui/browser_list.h"
-
-#include <gtk/gtk.h>
-
-// static
-void BrowserList::HandleAppExitingForPlatform() {
-  // Close non-browser windows.
-  GList* window_list = gtk_window_list_toplevels();
-  g_list_foreach(window_list, (GFunc)g_object_ref, NULL);
-  for (GList* i = window_list; i != NULL; i = g_list_next(i)) {
-    GtkWindow* window = GTK_WINDOW(i->data);
-    // We filter by visible widgets because there are toplevel windows that if
-    // we try to destroy, we crash.  For example, trying to destroy the tooltip
-    // window or the toplevel associated with drop down windows crashes.
-    // We further filter to only close dialogs, as blindly closing all windows
-    // causes problems with things like status icons.
-    if (gtk_widget_get_visible(GTK_WIDGET(window)) &&
-        (GTK_IS_DIALOG(GTK_WIDGET(window))))
-      gtk_widget_destroy(GTK_WIDGET(window));
-  }
-  g_list_foreach(window_list, (GFunc)g_object_unref, NULL);
-  g_list_free(window_list);
-}