Remove remaining HTML elements

sky/engine/core/rendering/RenderIFrame.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_RENDERING_RENDERIFRAME_H_
-#define SKY_ENGINE_CORE_RENDERING_RENDERIFRAME_H_
-
-#include "sky/engine/core/rendering/RenderReplaced.h"
-
-namespace blink {
-
-class HTMLIFrameElement;
-
-class RenderIFrame : public RenderReplaced {
-public:
-    explicit RenderIFrame(HTMLIFrameElement*);
-    virtual ~RenderIFrame();
-
-    void updateWidgetBounds();
-
-private:
-    LayerType layerTypeRequired() const override { return NormalLayer; }
-    void paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset) override;
-};
-
-} // namespace blink
-
-#endif  // SKY_ENGINE_CORE_RENDERING_RENDERIFRAME_H_