Update DOM code to use the new Traversal<HTML*Element> API

Source/core/dom/TreeScope.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 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 254 matching lines @@
 }
 
 HTMLLabelElement* TreeScope::labelElementForId(const AtomicString& forAttributeValue)
 {
     if (forAttributeValue.isEmpty())
         return 0;
 
     if (!m_labelsByForAttribute) {
         // Populate the map on first access.
         m_labelsByForAttribute = adoptPtr(new DocumentOrderedMap);
-        for (Element* element = ElementTraversal::firstWithin(rootNode()); element; element = ElementTraversal::next(*element)) {
-            if (element->hasTagName(labelTag)) {
-                HTMLLabelElement* label = toHTMLLabelElement(element);
-                const AtomicString& forValue = label->fastGetAttribute(forAttr);
-                if (!forValue.isEmpty())
-                    addLabel(forValue, label);
-            }
+        for (HTMLLabelElement* label = Traversal<HTMLLabelElement>::firstWithin(rootNode()); label; label = Traversal<HTMLLabelElement>::next(*label)) {
+            const AtomicString& forValue = label->fastGetAttribute(forAttr);
+            if (!forValue.isEmpty())
+                addLabel(forValue, label);
         }
     }
 
     return toHTMLLabelElement(m_labelsByForAttribute->getElementByLabelForAttribute(forAttributeValue.impl(), this));
 }
 
 DOMSelection* TreeScope::getSelection() const
 {
     if (!rootNode().document().frame())
         return 0;
 
     if (m_selection)
         return m_selection.get();
 
     // FIXME: The correct selection in Shadow DOM requires that Position can have a ShadowRoot
     // as a container.
     // See https://bugs.webkit.org/show_bug.cgi?id=82697
     m_selection = DOMSelection::create(this);
     return m_selection.get();
 }
 
 Element* TreeScope::findAnchor(const String& name)
 {
     if (name.isEmpty())
         return 0;
     if (Element* element = getElementById(AtomicString(name)))
         return element;
-    for (Element* element = ElementTraversal::firstWithin(rootNode()); element; element = ElementTraversal::next(*element)) {
-        if (element->hasTagName(aTag)) {
-            HTMLAnchorElement* anchor = toHTMLAnchorElement(element);
-            if (rootNode().document().inQuirksMode()) {
-                // Quirks mode, case insensitive comparison of names.
-                if (equalIgnoringCase(anchor->name(), name))
-                    return anchor;
-            } else {
-                // Strict mode, names need to match exactly.
-                if (anchor->name() == name)
-                    return anchor;
-            }
+    for (HTMLAnchorElement* anchor = Traversal<HTMLAnchorElement>::firstWithin(rootNode()); anchor; anchor = Traversal<HTMLAnchorElement>::next(*anchor)) {
+        if (rootNode().document().inQuirksMode()) {
+            // Quirks mode, case insensitive comparison of names.
+            if (equalIgnoringCase(anchor->name(), name))
+                return anchor;
+        } else {
+            // Strict mode, names need to match exactly.
+            if (anchor->name() == name)
+                return anchor;
         }
     }
     return 0;
 }
 
 bool TreeScope::applyAuthorStyles() const
 {
     return !rootNode().isShadowRoot() || toShadowRoot(rootNode()).applyAuthorStyles();
 }
 
@@ skipping 162 matching lines @@
     for (Element* element = ElementTraversal::firstWithin(rootNode()); element; element = ElementTraversal::nextIncludingPseudo(*element)) {
         for (ShadowRoot* root = element->youngestShadowRoot(); root; root = root->olderShadowRoot())
             root->setNeedsStyleRecalcForViewportUnits();
         RenderStyle* style = element->renderStyle();
         if (style && style->hasViewportUnits())
             element->setNeedsStyleRecalc(LocalStyleChange);
     }
 }
 
 } // namespace WebCore