Use toElement instead of static_cast<Element*> and static_cast<const Element*>

Source/core/editing/FrameSelection.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 Apple Inc. 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
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1458 matching lines @@
 
     if (element && element->renderer())
         caretColor = element->renderer()->style()->visitedDependentColor(CSSPropertyColor);
 
     context->fillRect(caret, caretColor);
 }
 
 void FrameSelection::debugRenderer(RenderObject *r, bool selected) const
 {
     if (r->node()->isElementNode()) {
-        Element* element = static_cast<Element *>(r->node());
+        Element* element = toElement(r->node());
         fprintf(stderr, "%s%s\n", selected ? "==> " : "    ", element->localName().string().utf8().data());
     } else if (r->isText()) {
         RenderText* textRenderer = toRenderText(r);
         if (!textRenderer->textLength() || !textRenderer->firstTextBox()) {
             fprintf(stderr, "%s#text (empty)\n", selected ? "==> " : "    ");
             return;
         }
         
         static const int max = 36;
         String text = textRenderer->text();
@@ skipping 608 matching lines @@
     sel.showTreeForThis();
 }
 
 void showTree(const WebCore::FrameSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
 }
 
 #endif