Get rid of loops looking for the first Element ancestor

Source/core/accessibility/AXNodeObject.cpp

 /*
 * Copyright (C) 2012, Google 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
@@ skipping 379 matching lines @@
     return siblingWithAriaRole("menuitem", node());
 }
 
 Element* AXNodeObject::mouseButtonListener() const
 {
     Node* node = this->node();
     if (!node)
         return 0;
 
     // check if our parent is a mouse button listener
-    while (node && !node->isElementNode())
-        node = node->parentNode();
+    if (!node->isElementNode())
+        node = node->parentElement();
 
     if (!node)
         return 0;
 
     // FIXME: Do the continuation search like anchorElement does
     for (Element* element = toElement(node); element; element = element->parentElement()) {
         if (element->getAttributeEventListener(EventTypeNames::click) || element->getAttributeEventListener(EventTypeNames::mousedown) || element->getAttributeEventListener(EventTypeNames::mouseup))
             return element;
     }
 
@@ skipping 1283 matching lines @@
     float range = maxValueForRange() - minValueForRange();
     float value = valueForRange();
 
     value += range * (percentChange / 100);
     setValue(String::number(value));
 
     axObjectCache()->postNotification(node(), AXObjectCache::AXValueChanged, true);
 }
 
 } // namespace blink