Replace RenderArena with PartitionAlloc

Source/core/rendering/RenderWidgetProtector.h

-/*
- * Copyright (C) 2009 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef RenderWidgetProtector_h
-#define RenderWidgetProtector_h
-
-#include "core/rendering/RenderWidget.h"
-
-namespace WebCore {
-
-class RenderWidgetProtector {
-    WTF_MAKE_NONCOPYABLE(RenderWidgetProtector);
-public:
-    explicit RenderWidgetProtector(RenderWidget* object)
-        : m_object(object)
-        , m_arena(object->ref())
-    {
-    }
-
-    ~RenderWidgetProtector()
-    {
-        m_object->deref(m_arena);
-    }
-
-private:
-    RenderWidget* m_object;
-    RenderArena* m_arena;
-};
-
-}
-
-#endif // RenderWidgetProtector_h