add 'slow' prefix to RenderObject's firstChild() / lastChild() methods

Source/core/editing/htmlediting.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 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 34 matching lines @@
 #include "core/editing/VisibleUnits.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLBRElement.h"
 #include "core/html/HTMLDivElement.h"
 #include "core/html/HTMLLIElement.h"
 #include "core/html/HTMLOListElement.h"
 #include "core/html/HTMLParagraphElement.h"
 #include "core/html/HTMLTableCellElement.h"
 #include "core/html/HTMLUListElement.h"
 #include "core/rendering/RenderObject.h"
+#include "core/rendering/RenderTableCell.h"
 #include "wtf/Assertions.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/StringBuilder.h"
 
 using namespace std;
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
@@ skipping 698 matching lines @@
     RenderObject* renderer = node->renderer();
     if (renderer->isBR()) {
         renderer = renderer->parent();
         if (!renderer)
             return false;
     }
     if (!renderer->isTableCell())
         return false;
 
     // Check that the table cell contains no child renderers except for perhaps a single <br>.
-    RenderObject* childRenderer = renderer->firstChild();
+    RenderObject* childRenderer = toRenderTableCell(renderer)->firstChild();
     if (!childRenderer)
         return true;
     if (!childRenderer->isBR())
         return false;
     return !childRenderer->nextSibling();
 }
 
 PassRefPtr<HTMLElement> createDefaultParagraphElement(Document& document)
 {
     switch (document.frame()->editor().defaultParagraphSeparator()) {
@@ skipping 328 matching lines @@
     // if the selection starts just before a paragraph break, skip over it
     if (isEndOfParagraph(visiblePosition))
         return visiblePosition.next().deepEquivalent().downstream();
 
     // otherwise, make sure to be at the start of the first selected node,
     // instead of possibly at the end of the last node before the selection
     return visiblePosition.deepEquivalent().downstream();
 }
 
 } // namespace WebCore