Have ElementTraversal / NodeTraversal's next() methods take a reference

Source/core/html/track/TextTrackCue.cpp

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2011, 2012, 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 610 matching lines @@
 void TextTrackCue::determineTextDirection()
 {
     DEFINE_STATIC_LOCAL(const String, rtTag, ("rt"));
     createWebVTTNodeTree();
 
     // Apply the Unicode Bidirectional Algorithm's Paragraph Level steps to the
     // concatenation of the values of each WebVTT Text Object in nodes, in a
     // pre-order, depth-first traversal, excluding WebVTT Ruby Text Objects and
     // their descendants.
     StringBuilder paragraphBuilder;
-    for (Node* node = m_webVTTNodeTree->firstChild(); node; node = NodeTraversal::next(node, m_webVTTNodeTree.get())) {
+    for (Node* node = m_webVTTNodeTree->firstChild(); node; node = NodeTraversal::next(*node, m_webVTTNodeTree.get())) {
         if (!node->isTextNode() || node->localName() == rtTag)
             continue;
 
         paragraphBuilder.append(node->nodeValue());
     }
 
     String paragraph = paragraphBuilder.toString();
     if (!paragraph.length())
         return;
 
@@ skipping 138 matching lines @@
 
 void TextTrackCue::markFutureAndPastNodes(ContainerNode* root, double previousTimestamp, double movieTime)
 {
     DEFINE_STATIC_LOCAL(const String, timestampTag, ("timestamp"));
 
     bool isPastNode = true;
     double currentTimestamp = previousTimestamp;
     if (currentTimestamp > movieTime)
         isPastNode = false;
 
-    for (Node* child = root->firstChild(); child; child = NodeTraversal::next(child, root)) {
+    for (Node* child = root->firstChild(); child; child = NodeTraversal::next(*child, root)) {
         if (child->nodeName() == timestampTag) {
             unsigned position = 0;
             String timestamp = child->nodeValue();
             double currentTimestamp = WebVTTParser::collectTimeStamp(timestamp, &position);
             ASSERT(currentTimestamp != -1);
 
             if (currentTimestamp > movieTime)
                 isPastNode = false;
         }
 
@@ skipping 423 matching lines @@
         return false;
     if (m_cueSize != cue.size())
         return false;
     if (align() != cue.align())
         return false;
 
     return true;
 }
 
 } // namespace WebCore