Make infobars ignore button clicks when closing.

chrome/browser/ui/gtk/infobars/confirm_infobar_gtk.cc

 // Copyright (c) 2011 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/gtk/infobars/confirm_infobar_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/gtk/gtk_chrome_link_button.h"
@@ skipping 64 matching lines @@
 
     gtk_util::CenterWidgetInHBox(confirm_hbox_, button, true, 0);
     g_signal_connect(button, "clicked",
                      G_CALLBACK(type == ConfirmInfoBarDelegate::BUTTON_OK ?
                                 OnOkButtonThunk : OnCancelButtonThunk),
                      this);
   }
 }
 
 void ConfirmInfoBarGtk::OnOkButton(GtkWidget* widget) {
+  if (!owned())
+    return;  // We're closing; don't call anything, it might access the owner.
   if (delegate()->AsConfirmInfoBarDelegate()->Accept())
     RemoveSelf();
 }
 
 void ConfirmInfoBarGtk::OnCancelButton(GtkWidget* widget) {
+  if (!owned())
+    return;  // We're closing; don't call anything, it might access the owner.
   if (delegate()->AsConfirmInfoBarDelegate()->Cancel())
     RemoveSelf();
 }
 
 void ConfirmInfoBarGtk::OnLinkClicked(GtkWidget* widget) {
+  if (!owned())
+    return;  // We're closing; don't call anything, it might access the owner.
   if (delegate()->AsConfirmInfoBarDelegate()->LinkClicked(
         gtk_util::DispositionForCurrentButtonPressEvent()))
     RemoveSelf();
 }