Inroduce toSVGInlineTextBox, and use it.

Source/core/rendering/svg/SVGRenderTreeAsText.cpp

 /*
  * Copyright (C) 2004, 2005, 2007, 2009 Apple Inc. All rights reserved.
  *           (C) 2005 Rob Buis <buis@kde.org>
  *           (C) 2006 Alexander Kellett <lypanov@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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
@@ skipping 432 matching lines @@
         ts << ": " << quoteAndEscapeNonPrintables(text.substring(fragment.characterOffset, fragment.length)) << "\n";
     }
 }
 
 static inline void writeSVGInlineTextBoxes(TextStream& ts, const RenderText& text, int indent)
 {
     for (InlineTextBox* box = text.firstTextBox(); box; box = box->nextTextBox()) {
         if (!box->isSVGInlineTextBox())
             continue;
 
-        writeSVGInlineTextBox(ts, static_cast<SVGInlineTextBox*>(box), indent);
+        writeSVGInlineTextBox(ts, toSVGInlineTextBox(box), indent);
     }
 }
 
 static void writeStandardPrefix(TextStream& ts, const RenderObject& object, int indent)
 {
     writeIndent(ts, indent);
     ts << object.renderName();
 
     if (object.node())
         ts << " {" << object.node()->nodeName() << "}";
@@ skipping 205 matching lines @@
             ts << " ";
             writeNameAndQuotedValue(ts, "filter", svgStyle->filterResource());
             ts << " ";
             writeStandardPrefix(ts, *filter, 0);
             ts << " " << filter->resourceBoundingBox(&renderer) << "\n";
         }
     }
 }
 
 } // namespace WebCore