Get rid of loops looking for the first Element ancestor

Source/core/dom/Position.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2009 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 260 matching lines @@
         if (offset == 0)
             return Position::PositionIsBeforeAnchor;
         return Position::PositionIsAfterAnchor;
     }
     return Position::PositionIsOffsetInAnchor;
 }
 
 // FIXME: This method is confusing (does it return anchorNode() or containerNode()?) and should be renamed or removed
 Element* Position::element() const
 {
-    Node* n = anchorNode();
-    while (n && !n->isElementNode())
-        n = n->parentNode();
-    return toElement(n);
+    Node* node = anchorNode();
+    if (!node || node->isElementNode())
+        return toElement(node);
+    return node->parentElement();
 }
 
 PassRefPtrWillBeRawPtr<CSSComputedStyleDeclaration> Position::computedStyle() const
 {
     Element* elem = element();
     if (!elem)
         return nullptr;
     return CSSComputedStyleDeclaration::create(elem);
 }
 
@@ skipping 1009 matching lines @@
     pos.showTreeForThis();
 }
 
 void showTree(const blink::Position* pos)
 {
     if (pos)
         pos->showTreeForThis();
 }
 
 #endif