Make infobars ignore button clicks when closing.

chrome/browser/ui/views/infobars/translate_message_infobar.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/views/infobars/translate_message_infobar.h"
 
 #include "chrome/browser/translate/translate_infobar_delegate.h"
 #include "views/controls/button/text_button.h"
 #include "views/controls/label.h"
 
@@ skipping 39 matching lines @@
     }
   }
 
   // This must happen after adding all other children so InfoBarView can ensure
   // the close button is the last child.
   TranslateInfoBarBase::ViewHierarchyChanged(is_add, parent, child);
 }
 
 void TranslateMessageInfoBar::ButtonPressed(views::Button* sender,
                                             const views::Event& event) {
+  if (!owned())
+    return;  // We're closing; don't call anything, it might access the owner.
   if (sender == button_)
     GetDelegate()->MessageInfoBarButtonPressed();
   else
     TranslateInfoBarBase::ButtonPressed(sender, event);
 }
 
 int TranslateMessageInfoBar::ContentMinimumWidth() const {
   return (button_ != NULL) ?
       (button_->GetPreferredSize().width() + kButtonInLabelSpacing) : 0;
 }