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

Source/core/dom/Traversal.h

Index: Source/core/dom/Traversal.h
diff --git a/Source/core/dom/Traversal.h b/Source/core/dom/Traversal.h
new file mode 100644
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+++ b/Source/core/dom/Traversal.h
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+/*
+ * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
+ * Copyright (C) 2001 Peter Kelly (pmk@post.com)
+ * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
+ * Copyright (C) 2004, 2008 Apple Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef Traversal_h
+#define Traversal_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;
+    };
+
+} // namespace WebCore
+
+#endif // Traversal_h