Get rid of loops looking for the first Element ancestor

Source/core/xml/parser/XMLDocumentParser.cpp

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2005, 2006, 2008, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Holger Hans Peter Freyther
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 783 matching lines @@
 {
 #if !ENABLE(OILPAN)
     fragment->ref();
 #endif
 
     // Add namespaces based on the parent node
     WillBeHeapVector<RawPtrWillBeMember<Element> > elemStack;
     while (parentElement) {
         elemStack.append(parentElement);
 
-        ContainerNode* n = parentElement->parentNode();
-        if (!n || !n->isElementNode())
+        Element* grandParentElement = parentElement->parentElement();
+        if (!grandParentElement)
             break;
-        parentElement = toElement(n);
+        parentElement = grandParentElement;
     }
 
     if (elemStack.isEmpty())
         return;
 
     for (; !elemStack.isEmpty(); elemStack.removeLast()) {
         Element* element = elemStack.last();
         AttributeCollection attributes = element->attributes();
         AttributeCollection::iterator end = attributes.end();
         for (AttributeCollection::iterator it = attributes.begin(); it != end; ++it) {
@@ skipping 810 matching lines @@
     sax.initialized = XML_SAX2_MAGIC;
     RefPtr<XMLParserContext> parser = XMLParserContext::createStringParser(&sax, &state);
     String parseString = "<?xml version=\"1.0\"?><attrs " + string + " />";
     parseChunk(parser->context(), parseString);
     finishParsing(parser->context());
     attrsOK = state.gotAttributes;
     return state.attributes;
 }
 
 } // namespace blink