Revert of Reland "Implement FullScreen using top layer."

third_party/WebKit/Source/core/layout/api/LayoutFullScreenItem.h

+
+// Copyright 2016 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 LayoutFullScreenItem_h
+#define LayoutFullScreenItem_h
+
+#include "core/layout/LayoutBlock.h"
+#include "core/layout/api/LayoutBlockItem.h"
+
+namespace blink {
+
+class LayoutFullScreenItem : public LayoutBlockItem {
+public:
+    explicit LayoutFullScreenItem(LayoutBlock* layoutBlock)
+        : LayoutBlockItem(layoutBlock)
+    {
+    }
+
+    explicit LayoutFullScreenItem(const LayoutBlockItem& item)
+        : LayoutBlockItem(item)
+    {
+        SECURITY_DCHECK(!item || item.isLayoutFullScreen());
+    }
+
+    explicit LayoutFullScreenItem(std::nullptr_t) : LayoutBlockItem(nullptr) { }
+
+    LayoutFullScreenItem() { }
+
+    void unwrapLayoutObject()
+    {
+        return toFullScreen()->unwrapLayoutObject();
+    }
+
+private:
+    LayoutFullScreen* toFullScreen() { return toLayoutFullScreen(layoutObject()); }
+    const LayoutFullScreen* toFullScreen() const { return toLayoutFullScreen(layoutObject()); }
+};
+
+} // namespace blink
+
+#endif // LayoutFullScreenItem_h