Add template parameter to ElementTraversal to iterate over Elements of a specific type

Source/core/dom/NodeIteratorBase.h

Index: Source/core/dom/NodeIteratorBase.h
diff --git a/Source/core/dom/Traversal.h b/Source/core/dom/NodeIteratorBase.h
similarity index 55%
rename from Source/core/dom/Traversal.h
rename to Source/core/dom/NodeIteratorBase.h
index 58ef1524eefc3379b47e2c626878ef8bfa2ad849..0118e3ee1405dc7c8b6805a39e3bf06cf42e9106 100644
--- a/Source/core/dom/Traversal.h
+++ b/Source/core/dom/NodeIteratorBase.h
@@ -22,37 +22,37 @@
  *
  */
 
-#ifndef Traversal_h
-#define Traversal_h
+#ifndef NodeIteratorBase_h
+#define NodeIteratorBase_h
 
 #include "bindings/v8/ScriptState.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
-    class Node;
-    class NodeFilter;
-
-    class Traversal {
-    public:
-        Node* root() const { return m_root.get(); }
-        unsigned whatToShow() const { return m_whatToShow; }
-        NodeFilter* filter() const { return m_filter.get(); }
-        // |expandEntityReferences| first appeared in "DOM Level 2 Traversal and Range". However, this argument was
-        // never implemented, and, in DOM4, the function argument |expandEntityReferences| is removed from
-        // Document.createNodeIterator() and Document.createTreeWalker().
-        bool expandEntityReferences() const { return false; }
-
-    protected:
-        Traversal(PassRefPtr<Node>, unsigned whatToShow, PassRefPtr<NodeFilter>);
-        short acceptNode(ScriptState*, Node*) const;
-
-    private:
-        RefPtr<Node> m_root;
-        unsigned m_whatToShow;
-        RefPtr<NodeFilter> m_filter;
-    };
+class Node;
+class NodeFilter;
+
+class NodeIteratorBase {
+public:
+    Node* root() const { return m_root.get(); }
+    unsigned whatToShow() const { return m_whatToShow; }
+    NodeFilter* filter() const { return m_filter.get(); }
+    // |expandEntityReferences| first appeared in "DOM Level 2 Traversal and Range". However, this argument was
+    // never implemented, and, in DOM4, the function argument |expandEntityReferences| is removed from
+    // Document.createNodeIterator() and Document.createTreeWalker().
+    bool expandEntityReferences() const { return false; }
+
+protected:
+    NodeIteratorBase(PassRefPtr<Node>, unsigned whatToShow, PassRefPtr<NodeFilter>);
+    short acceptNode(ScriptState*, Node*) const;
+
+private:
+    RefPtr<Node> m_root;
+    unsigned m_whatToShow;
+    RefPtr<NodeFilter> m_filter;
+};
 
 } // namespace WebCore
 
-#endif // Traversal_h
+#endif // NodeIteratorBase_h