Minimize RenderObject* casting to RenderText*

Source/core/rendering/svg/SVGRootInlineBox.cpp

 /*
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2006 Apple Computer Inc.
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2011 Torch Mobile (Beijing) CO. Ltd. 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
@@ skipping 241 matching lines @@
             *last = temp;
             ++first;
             continue;
         }
 
         SVGInlineTextBox* firstTextBox = toSVGInlineTextBox(*first);
         SVGInlineTextBox* lastTextBox = toSVGInlineTextBox(*last);
 
         // Reordering is only necessary for BiDi text that is _absolutely_ positioned.
         if (firstTextBox->len() == 1 && firstTextBox->len() == lastTextBox->len()) {
-            RenderSVGInlineText& firstContext = toRenderSVGInlineText(firstTextBox->textRenderer());
-            RenderSVGInlineText& lastContext = toRenderSVGInlineText(lastTextBox->textRenderer());
+            RenderSVGInlineText& firstContext = toRenderSVGInlineText(firstTextBox->renderer());
+            RenderSVGInlineText& lastContext = toRenderSVGInlineText(lastTextBox->renderer());
 
             SVGTextLayoutAttributes* firstAttributes = 0;
             SVGTextLayoutAttributes* lastAttributes = 0;
             findFirstAndLastAttributesInVector(attributes, &firstContext, &lastContext, firstAttributes, lastAttributes);
             swapItemsInLayoutAttributes(firstAttributes, lastAttributes, firstTextBox->start(), lastTextBox->start());
         }
 
         InlineBox* temp = *first;
         *first = *last;
         *last = temp;
 
         ++first;
     }
 }
 
 void SVGRootInlineBox::reorderValueLists(Vector<SVGTextLayoutAttributes*>& attributes)
 {
     Vector<InlineBox*> leafBoxesInLogicalOrder;
     collectLeafBoxesInLogicalOrder(leafBoxesInLogicalOrder, reverseInlineBoxRangeAndValueListsIfNeeded, &attributes);
 }
 
 } // namespace blink