Make infobars ignore button clicks when closing.

chrome/browser/ui/gtk/infobars/link_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/link_infobar_gtk.h"
 
 #include "chrome/browser/tab_contents/link_infobar_delegate.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
 
 // LinkInfoBarDelegate ---------------------------------------------------------
@@ skipping 11 matching lines @@
   string16 display_text = delegate->GetMessageTextWithOffset(&link_offset);
   string16 link_text = delegate->GetLinkText();
   AddLabelWithInlineLink(display_text, link_text, link_offset,
                          G_CALLBACK(OnLinkClickedThunk));
 }
 
 LinkInfoBarGtk::~LinkInfoBarGtk() {
 }
 
 void LinkInfoBarGtk::OnLinkClicked(GtkWidget* button) {
+  if (!owned())
+    return;  // We're closing; don't call anything, it might access the owner.
   if (GetDelegate()->LinkClicked(
         gtk_util::DispositionForCurrentButtonPressEvent()))
     RemoveSelf();
 }
 
 LinkInfoBarDelegate* LinkInfoBarGtk::GetDelegate() {
   return delegate()->AsLinkInfoBarDelegate();
 }