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

Source/core/rendering/RenderTreeAsText.cpp

 /*
  * Copyright (C) 2004, 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 456 matching lines @@
     ts << "\n";
 
     if (o.isText() && !o.isBR()) {
         const RenderText& text = *toRenderText(&o);
         for (InlineTextBox* box = text.firstTextBox(); box; box = box->nextTextBox()) {
             writeIndent(ts, indent + 1);
             writeTextRun(ts, text, *box);
         }
     }
 
-    for (RenderObject* child = o.firstChild(); child; child = child->nextSibling()) {
+    for (RenderObject* child = o.slowFirstChild(); child; child = child->nextSibling()) {
         if (child->hasLayer())
             continue;
         write(ts, *child, indent + 1, behavior);
     }
 
     if (o.isWidget()) {
         Widget* widget = toRenderWidget(&o)->widget();
         if (widget && widget->isFrameView()) {
             FrameView* view = toFrameView(widget);
             RenderView* root = view->frame().contentRenderer();
@@ skipping 241 matching lines @@
 
     RenderObject* renderer = element->renderer();
     if (!renderer || !renderer->isBox())
         return String();
 
     return externalRepresentation(toRenderBox(renderer), behavior | RenderAsTextShowAllLayers);
 }
 
 static void writeCounterValuesFromChildren(TextStream& stream, RenderObject* parent, bool& isFirstCounter)
 {
-    for (RenderObject* child = parent->firstChild(); child; child = child->nextSibling()) {
+    for (RenderObject* child = parent->slowFirstChild(); child; child = child->nextSibling()) {
         if (child->isCounter()) {
             if (!isFirstCounter)
                 stream << " ";
             isFirstCounter = false;
             String str(toRenderText(child)->text());
             stream << str;
         }
     }
 }
 
@@ skipping 19 matching lines @@
     element->document().updateLayout();
 
     RenderObject* renderer = element->renderer();
     if (!renderer || !renderer->isListItem())
         return String();
 
     return toRenderListItem(renderer)->markerText();
 }
 
 } // namespace WebCore