add 'slow' prefix to RenderObject's firstChild() / lastChild() methods

Source/core/dom/ContainerNode.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 686 matching lines @@
     RenderObject* o = renderer();
 
     if (!o->isInline() || o->isReplaced()) {
         point = o->localToAbsolute(FloatPoint(), UseTransforms);
         return true;
     }
 
     // find the next text/image child, to get a position
     while (o) {
         RenderObject* p = o;
-        if (o->firstChild()) {
-            o = o->firstChild();
+        if (RenderObject* oFirstChild = o->slowFirstChild()) {
+            o = oFirstChild;
         } else if (o->nextSibling()) {
             o = o->nextSibling();
         } else {
             RenderObject* next = 0;
             while (!next && o->parent()) {
                 o = o->parent();
                 next = o->nextSibling();
             }
             o = next;
 
@@ skipping 38 matching lines @@
 
     RenderObject* o = renderer();
     if (!o->isInline() || o->isReplaced()) {
         RenderBox* box = toRenderBox(o);
         point = o->localToAbsolute(LayoutPoint(box->size()), UseTransforms);
         return true;
     }
 
     // find the last text/image child, to get a position
     while (o) {
-        if (o->lastChild()) {
-            o = o->lastChild();
+        if (RenderObject* oLastChild = o->slowLastChild()) {
+            o = oLastChild;
         } else if (o->previousSibling()) {
             o = o->previousSibling();
         } else {
             RenderObject* prev = 0;
         while (!prev) {
             o = o->parent();
             if (!o)
                 return false;
             prev = o->previousSibling();
         }
@@ skipping 439 matching lines @@
         return true;
 
     if (node->isElementNode() && toElement(node)->shadow())
         return true;
 
     return false;
 }
 #endif
 
 } // namespace WebCore