Minimize RenderObject* casting to RenderText*

Source/core/dom/Range.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Gunnstein Lye (gunnstein@netcom.no)
  * (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
  * (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Motorola Mobility. 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
@@ skipping 1641 matching lines @@
             if (!nodeSet.contains(node->parentNode())) {
                 if (RenderBoxModelObject* renderBoxModelObject = toElement(node)->renderBoxModelObject()) {
                     Vector<FloatQuad> elementQuads;
                     renderBoxModelObject->absoluteQuads(elementQuads);
                     m_ownerDocument->adjustFloatQuadsForScrollAndAbsoluteZoom(elementQuads, *renderBoxModelObject);
 
                     quads.appendVector(elementQuads);
                 }
             }
         } else if (node->isTextNode()) {
-            if (RenderObject* renderer = toText(node)->renderer()) {
-                RenderText& renderText = toRenderText(*renderer);
+            if (RenderText* renderText = toText(node)->renderer()) {
                 int startOffset = (node == startContainer) ? m_start.offset() : 0;
                 int endOffset = (node == endContainer) ? m_end.offset() : INT_MAX;
 
                 Vector<FloatQuad> textQuads;
-                renderText.absoluteQuadsForRange(textQuads, startOffset, endOffset);
-                m_ownerDocument->adjustFloatQuadsForScrollAndAbsoluteZoom(textQuads, renderText);
+                renderText->absoluteQuadsForRange(textQuads, startOffset, endOffset);
+                m_ownerDocument->adjustFloatQuadsForScrollAndAbsoluteZoom(textQuads, *renderText);
 
                 quads.appendVector(textQuads);
             }
         }
     }
 }
 
 FloatRect Range::boundingRect() const
 {
     m_ownerDocument->updateLayoutIgnorePendingStylesheets();
@@ skipping 23 matching lines @@
 
 void showTree(const blink::Range* range)
 {
     if (range && range->boundaryPointsValid()) {
         range->startContainer()->showTreeAndMark(range->startContainer(), "S", range->endContainer(), "E");
         fprintf(stderr, "start offset: %d, end offset: %d\n", range->startOffset(), range->endOffset());
     }
 }
 
 #endif