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

Source/core/rendering/svg/SVGTextLayoutAttributesBuilder.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010-2011. 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 87 matching lines @@
 
         lastCharacter = currentCharacter;
         ++atCharacter;
     }
 }
 
 void SVGTextLayoutAttributesBuilder::collectTextPositioningElements(RenderObject* start, UChar& lastCharacter)
 {
     ASSERT(!start->isSVGText() || m_textPositions.isEmpty());
 
-    for (RenderObject* child = start->firstChild(); child; child = child->nextSibling()) {
+    for (RenderObject* child = start->slowFirstChild(); child; child = child->nextSibling()) {
         if (child->isSVGInlineText()) {
             processRenderSVGInlineText(toRenderSVGInlineText(child), m_textLength, lastCharacter);
             continue;
         }
 
         if (!child->isSVGInline())
             continue;
 
         SVGTextPositioningElement* element = SVGTextPositioningElement::elementFromRenderer(child);
         unsigned atPosition = m_textPositions.size();
@@ skipping 107 matching lines @@
             data.rotate = lastRotation;
             m_characterDataMap.set(position.start + i + 1, data);
             continue;
         }
 
         it->value.rotate = lastRotation;
     }
 }
 
 }