Have HTMLTableRowsCollection::item() return an HTMLTableRowElement*

Source/core/accessibility/AXTable.cpp

 /*
  * Copyright (C) 2008 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
@@ skipping 123 matching lines @@
     RefPtrWillBeRawPtr<HTMLCollection> bodies = tableElement->tBodies();
     for (unsigned bodyIndex = 0; bodyIndex < bodies->length(); ++bodyIndex) {
         Element* bodyElement = bodies->item(bodyIndex);
         if (elementHasAriaRole(bodyElement))
             return false;
     }
 
     RefPtrWillBeRawPtr<HTMLTableRowsCollection> rows = tableElement->rows();
     unsigned rowCount = rows->length();
     for (unsigned rowIndex = 0; rowIndex < rowCount; ++rowIndex) {
-        Element* rowElement = rows->item(rowIndex);
+        HTMLTableRowElement* rowElement = rows->item(rowIndex);
         if (elementHasAriaRole(rowElement))
             return false;
-        if (isHTMLTableRowElement(*rowElement)) {
-            RefPtrWillBeRawPtr<HTMLCollection> cells = toHTMLTableRowElement(rowElement)->cells();
-            for (unsigned cellIndex = 0; cellIndex < cells->length(); ++cellIndex) {
-                if (elementHasAriaRole(cells->item(cellIndex)))
-                    return false;
-            }
+        RefPtrWillBeRawPtr<HTMLCollection> cells = rowElement->cells();
+        for (unsigned cellIndex = 0; cellIndex < cells->length(); ++cellIndex) {
+            if (elementHasAriaRole(cells->item(cellIndex)))
+                return false;
         }
     }
 
     // If there is a caption element, summary, THEAD, or TFOOT section, it's most certainly a data table
     if (!tableElement->summary().isEmpty() || tableElement->tHead() || tableElement->tFoot() || tableElement->caption())
         return true;
 
     // if someone used "rules" attribute than the table should appear
     if (!tableElement->rules().isEmpty())
         return true;
@@ skipping 409 matching lines @@
     }
 
     // try the standard
     if (title.isEmpty())
         title = AXRenderObject::title();
 
     return title;
 }
 
 } // namespace blink