Remove the temporary scaffolding stubs.

chrome/browser/browser_list_gtk.cc

 // 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.
 
 #include "chrome/browser/browser_list.h"
 
 #include <gtk/gtk.h>
 
+// static
 void BrowserList::AllBrowsersClosed() {
   // 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.
     if (GTK_WIDGET_VISIBLE(GTK_WIDGET(window)))
       gtk_widget_destroy(GTK_WIDGET(window));
   }
   g_list_foreach(window_list, (GFunc)g_object_unref, NULL);
   g_list_free(window_list);
 }