Remove remaining HTML elements

sky/engine/core/html/HTMLTElement.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef SKY_ENGINE_CORE_HTML_HTMLITELEMENT_H_
-#define SKY_ENGINE_CORE_HTML_HTMLITELEMENT_H_
-
-#include "sky/engine/core/html/HTMLElement.h"
-
-namespace blink {
-
-class Document;
-
-class HTMLTElement final : public HTMLElement {
-    DEFINE_WRAPPERTYPEINFO();
-public:
-    static PassRefPtr<HTMLTElement> create(Document&);
-
-private:
-    explicit HTMLTElement(Document&);
-    ~HTMLTElement();
-};
-
-} // namespace blink
-
-#endif  // SKY_ENGINE_CORE_HTML_HTMLITELEMENT_H_