Remove remaining HTML elements

sky/engine/core/html/imports/HTMLImportTreeRoot.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_IMPORTS_HTMLIMPORTTREEROOT_H_
-#define SKY_ENGINE_CORE_HTML_IMPORTS_HTMLIMPORTTREEROOT_H_
-
-#include "sky/engine/core/html/imports/HTMLImport.h"
-#include "sky/engine/platform/Timer.h"
-#include "sky/engine/wtf/PassOwnPtr.h"
-
-namespace blink {
-
-class HTMLImportChild;
-
-class HTMLImportTreeRoot : public HTMLImport {
-public:
-    static PassOwnPtr<HTMLImportTreeRoot> create(Document*);
-
-    virtual ~HTMLImportTreeRoot();
-
-    // HTMLImport
-    virtual Document* document() const override;
-    virtual bool isDone() const override;
-    virtual void stateWillChange() override;
-    virtual void stateDidChange() override;
-
-    void scheduleRecalcState();
-
-    HTMLImportChild* add(PassOwnPtr<HTMLImportChild>);
-    HTMLImportChild* find(const KURL&) const;
-
-private:
-    explicit HTMLImportTreeRoot(Document*);
-
-    void recalcTimerFired(Timer<HTMLImportTreeRoot>*);
-
-    RawPtr<Document> m_document;
-    Timer<HTMLImportTreeRoot> m_recalcTimer;
-
-    // List of import which has been loaded or being loaded.
-    typedef Vector<OwnPtr<HTMLImportChild> > ImportList;
-    ImportList m_imports;
-};
-
-DEFINE_TYPE_CASTS(HTMLImportTreeRoot, HTMLImport, import, import->isRoot(), import.isRoot());
-
-}
-
-#endif  // SKY_ENGINE_CORE_HTML_IMPORTS_HTMLIMPORTTREEROOT_H_