Remove ElementFlags system.

sky/engine/core/dom/NodeRareData.h

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Smith <catfish.man@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 46 matching lines @@
     }
 
     NodeMutationObserverData* mutationObserverData() { return m_mutationObserverData.get(); }
     NodeMutationObserverData& ensureMutationObserverData()
     {
         if (!m_mutationObserverData)
             m_mutationObserverData = NodeMutationObserverData::create();
         return *m_mutationObserverData;
     }
 
-    bool hasElementFlag(ElementFlags mask) const { return m_elementFlags & mask; }
-    void setElementFlag(ElementFlags mask, bool value) { m_elementFlags = (m_elementFlags & ~mask) | (-(int32_t)value & mask); }
-    void clearElementFlag(ElementFlags mask) { m_elementFlags &= ~mask; }
-
 protected:
     explicit NodeRareData(RenderObject* renderer)
         : NodeRareDataBase(renderer)
-        , m_elementFlags(0)
         , m_isElementRareData(false)
     { }
 
 private:
     OwnPtr<NodeMutationObserverData> m_mutationObserverData;
 
-    unsigned m_elementFlags : NumberOfElementFlags;
 protected:
     unsigned m_isElementRareData : 1;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_DOM_NODERAREDATA_H_