Minimize RenderObject* casting to RenderText*

Source/core/rendering/svg/SVGTextLayoutEngine.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010-2012. 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 222 matching lines @@
     m_textPathStartOffset = 0;
     m_textPathCurrentOffset = 0;
     m_textPathSpacing = 0;
     m_textPathScaling = 1;
 }
 
 void SVGTextLayoutEngine::layoutInlineTextBox(SVGInlineTextBox* textBox)
 {
     ASSERT(textBox);
 
-    RenderSVGInlineText& text = toRenderSVGInlineText(textBox->textRenderer());
+    RenderSVGInlineText& text = toRenderSVGInlineText(textBox->renderer());
     ASSERT(text.parent());
     ASSERT(text.parent()->node());
     ASSERT(text.parent()->node()->isSVGElement());
 
     const RenderStyle* style = text.style();
     ASSERT(style);
 
     textBox->clearTextFragments();
     m_isVerticalText = style->svgStyle().isVerticalWritingMode();
     layoutTextOnLineOrPath(textBox, text, *style);
@@ skipping 389 matching lines @@
     }
 
     if (!didStartTextFragment)
         return;
 
     // Close last open fragment, if needed.
     recordTextFragment(textBox, visualMetricsValues);
 }
 
 }