Have LiveNodeListBase::ownerNode() return a reference

Source/core/html/HTMLTableRowsCollection.cpp

 /*
  * Copyright (C) 2008, 2011, 2012 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 44 matching lines @@
 
 static inline HTMLTableRowElement* findTableRowElementInChildren(Element& current)
 {
     for (Element* child = ElementTraversal::firstWithin(current); child; child = ElementTraversal::nextSibling(*child)) {
         if (isHTMLTableRowElement(child))
             return toHTMLTableRowElement(child);
     }
     return 0;
 }
 
-HTMLTableRowElement* HTMLTableRowsCollection::rowAfter(HTMLTableElement* table, HTMLTableRowElement* previous)
+HTMLTableRowElement* HTMLTableRowsCollection::rowAfter(HTMLTableElement& table, HTMLTableRowElement* previous)
 {
     Element* child = 0;
 
     // Start by looking for the next row in this section.
     // Continue only if there is none.
     if (previous && previous->parentNode() != table) {
         for (child = ElementTraversal::nextSibling(*previous); child; child = ElementTraversal::nextSibling(*child)) {
             if (isHTMLTableRowElement(child))
                 return toHTMLTableRowElement(child);
         }
     }
 
     // If still looking at head sections, find the first row in the next head section.
     if (!previous)
-        child = ElementTraversal::firstWithin(*table);
+        child = ElementTraversal::firstWithin(table);
     else if (isInHead(previous))
         child = ElementTraversal::nextSibling(*previous->parentNode());
     for (; child; child = ElementTraversal::nextSibling(*child)) {
         if (child->hasTagName(theadTag)) {
             if (HTMLTableRowElement* row = findTableRowElementInChildren(*child))
                 return row;
         }
     }
 
     // If still looking at top level and bodies, find the next row in top level or the first in the next body section.
     if (!previous || isInHead(previous))
-        child = ElementTraversal::firstWithin(*table);
+        child = ElementTraversal::firstWithin(table);
     else if (previous->parentNode() == table)
         child = ElementTraversal::nextSibling(*previous);
     else if (isInBody(previous))
         child = ElementTraversal::nextSibling(*previous->parentNode());
     for (; child; child = ElementTraversal::nextSibling(*child)) {
         if (isHTMLTableRowElement(child))
             return toHTMLTableRowElement(child);
         if (child->hasTagName(tbodyTag)) {
             if (HTMLTableRowElement* row = findTableRowElementInChildren(*child))
                 return row;
         }
     }
 
     // Find the first row in the next foot section.
     if (!previous || !isInFoot(previous))
-        child = ElementTraversal::firstWithin(*table);
+        child = ElementTraversal::firstWithin(table);
     else
         child = ElementTraversal::nextSibling(*previous->parentNode());
     for (; child; child = ElementTraversal::nextSibling(*child)) {
         if (child->hasTagName(tfootTag)) {
             if (HTMLTableRowElement* row = findTableRowElementInChildren(*child))
                 return row;
         }
     }
 
     return 0;
 }
 
-HTMLTableRowElement* HTMLTableRowsCollection::lastRow(HTMLTableElement* table)
+HTMLTableRowElement* HTMLTableRowsCollection::lastRow(HTMLTableElement& table)
 {
-    for (Node* child = table->lastChild(); child; child = child->previousSibling()) {
+    for (Node* child = table.lastChild(); child; child = child->previousSibling()) {
         if (child->hasTagName(tfootTag)) {
             for (Node* grandchild = child->lastChild(); grandchild; grandchild = grandchild->previousSibling()) {
                 if (isHTMLTableRowElement(grandchild))
                     return toHTMLTableRowElement(grandchild);
             }
         }
     }
 
-    for (Node* child = table->lastChild(); child; child = child->previousSibling()) {
+    for (Node* child = table.lastChild(); child; child = child->previousSibling()) {
         if (isHTMLTableRowElement(child))
             return toHTMLTableRowElement(child);
         if (child->hasTagName(tbodyTag)) {
             for (Node* grandchild = child->lastChild(); grandchild; grandchild = grandchild->previousSibling()) {
                 if (isHTMLTableRowElement(grandchild))
                     return toHTMLTableRowElement(grandchild);
             }
         }
     }
 
-    for (Node* child = table->lastChild(); child; child = child->previousSibling()) {
+    for (Node* child = table.lastChild(); child; child = child->previousSibling()) {
         if (child->hasTagName(theadTag)) {
             for (Node* grandchild = child->lastChild(); grandchild; grandchild = grandchild->previousSibling()) {
                 if (isHTMLTableRowElement(grandchild))
                     return toHTMLTableRowElement(grandchild);
             }
         }
     }
 
     return 0;
 }
@@ skipping 11 matching lines @@
 {
     return adoptRef(new HTMLTableRowsCollection(table));
 }
 
 Element* HTMLTableRowsCollection::virtualItemAfter(Element* previous) const
 {
     return rowAfter(toHTMLTableElement(ownerNode()), toHTMLTableRowElement(previous));
 }
 
 }