Add Traversal<*Element>::firstAncestor() API

Source/core/html/HTMLObjectElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 405 matching lines @@
 
     m_useFallbackContent = true;
 
     // FIXME: Style gets recalculated which is suboptimal.
     reattachFallbackContent();
 }
 
 bool HTMLObjectElement::isExposed() const
 {
     // http://www.whatwg.org/specs/web-apps/current-work/#exposed
-    for (Node* ancestor = parentNode(); ancestor; ancestor = ancestor->parentNode()) {
-        if (isHTMLObjectElement(*ancestor) && toHTMLObjectElement(ancestor)->isExposed())
+    for (HTMLObjectElement* ancestor = Traversal<HTMLObjectElement>::firstAncestor(*this); ancestor; ancestor = Traversal<HTMLObjectElement>::firstAncestor(*ancestor)) {
+        if (ancestor->isExposed())
             return false;
     }
     for (HTMLElement* element = Traversal<HTMLElement>::firstWithin(*this); element; element = Traversal<HTMLElement>::next(*element, this)) {
         if (isHTMLObjectElement(*element) || isHTMLEmbedElement(*element))
             return false;
     }
     return true;
 }
 
 bool HTMLObjectElement::containsJavaApplet() const
@@ skipping 45 matching lines @@
 {
     return fastHasAttribute(usemapAttr);
 }
 
 bool HTMLObjectElement::useFallbackContent() const
 {
     return HTMLPlugInElement::useFallbackContent() || m_useFallbackContent;
 }
 
 }