Use new Traversal<HTML*Element> API in HTML code

Source/core/html/HTMLTableRowElement.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2010 Apple Inc. 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 48 matching lines @@
         return -1;
 
     // To match Firefox, the row indices work like this:
     //   Rows from the first <thead> are numbered before all <tbody> rows.
     //   Rows from the first <tfoot> are numbered after all <tbody> rows.
     //   Rows from other <thead> and <tfoot> elements don't get row indices at all.
 
     int rIndex = 0;
 
     if (HTMLTableSectionElement* head = toHTMLTableElement(table)->tHead()) {
-        for (Element* row = ElementTraversal::firstWithin(*head); row; row = ElementTraversal::nextSibling(*row)) {
+        for (HTMLTableRowElement* row = Traversal<HTMLTableRowElement>::firstChild(*head); row; row = Traversal<HTMLTableRowElement>::nextSibling(*row)) {
             if (row == this)
                 return rIndex;
-            if (row->hasTagName(trTag))
-                ++rIndex;
+            ++rIndex;
         }
     }
 
     for (Element* child = ElementTraversal::firstWithin(*table); child; child = ElementTraversal::nextSibling(*child)) {
         if (child->hasTagName(tbodyTag)) {
             HTMLTableSectionElement* section = toHTMLTableSectionElement(child);
-            for (Element* row = ElementTraversal::firstWithin(*section); row; row = ElementTraversal::nextSibling(*row)) {
+            for (HTMLTableRowElement* row = Traversal<HTMLTableRowElement>::firstChild(*section); row; row = Traversal<HTMLTableRowElement>::nextSibling(*row)) {
                 if (row == this)
                     return rIndex;
-                if (row->hasTagName(trTag))
-                    ++rIndex;
+                ++rIndex;
             }
         }
     }
 
     if (HTMLTableSectionElement* foot = toHTMLTableElement(table)->tFoot()) {
-        for (Element* row = ElementTraversal::firstWithin(*foot); row; row = ElementTraversal::nextSibling(*row)) {
+        for (HTMLTableRowElement* row = Traversal<HTMLTableRowElement>::firstChild(*foot); row; row = Traversal<HTMLTableRowElement>::nextSibling(*row)) {
             if (row == this)
                 return rIndex;
-            if (row->hasTagName(trTag))
-                ++rIndex;
+            ++rIndex;
         }
     }
 
     // We get here for rows that are in <thead> or <tfoot> sections other than the main header and footer.
     return -1;
 }
 
 int HTMLTableRowElement::sectionRowIndex() const
 {
     int rIndex = 0;
@@ skipping 44 matching lines @@
         exceptionState.throwDOMException(IndexSizeError, "The value provided (" + String::number(index) + ") is outside the range [0, " + String::number(numCells) + ").");
     }
 }
 
 PassRefPtr<HTMLCollection> HTMLTableRowElement::cells()
 {
     return ensureCachedHTMLCollection(TRCells);
 }
 
 }