Get rid of loops looking for the first Element ancestor

Source/core/editing/htmlediting.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 557 matching lines @@
 {
     return n && n->renderer() && n->renderer()->isListItem();
 }
 
 Element* enclosingElementWithTag(const Position& p, const QualifiedName& tagName)
 {
     if (p.isNull())
         return 0;
 
     ContainerNode* root = highestEditableRoot(p);
-    for (Element* ancestor = ElementTraversal::firstAncestorOrSelf(*p.deprecatedNode()); ancestor; ancestor = ElementTraversal::firstAncestor(*ancestor)) {
+    Element* ancestor = p.deprecatedNode()->isElementNode() ? toElement(p.deprecatedNode()) : p.deprecatedNode()->parentElement();
+    for (; ancestor; ancestor = ancestor->parentElement()) {
         if (root && !ancestor->hasEditableStyle())
             continue;
         if (ancestor->hasTagName(tagName))
             return ancestor;
         if (ancestor == root)
             return 0;
     }
 
     return 0;
 }
@@ skipping 635 matching lines @@
     // if the selection starts just before a paragraph break, skip over it
     if (isEndOfParagraph(visiblePosition))
         return visiblePosition.next().deepEquivalent().downstream();
 
     // otherwise, make sure to be at the start of the first selected node,
     // instead of possibly at the end of the last node before the selection
     return visiblePosition.deepEquivalent().downstream();
 }
 
 } // namespace blink