*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/dom/ElementRareData.cpp

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * 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.
  */
 
 #include "config.h"
 #include "core/dom/ElementRareData.h"
 
-#include "core/rendering/RegionOversetState.h"
 #include "core/rendering/style/RenderStyle.h"
 
 namespace WebCore {
 
 struct SameSizeAsElementRareData : NodeRareData {
     short indices[2];
     unsigned bitfields;
-    RegionOversetState regionOversetState;
     LayoutSize sizeForResizing;
     IntSize scrollOffset;
     void* pointers[11];
 };
 
 CSSStyleDeclaration* ElementRareData::ensureInlineCSSStyleDeclaration(Element* ownerElement)
 {
     if (!m_cssomWrapper)
         m_cssomWrapper = adoptPtr(new InlineCSSStyleDeclaration(ownerElement));
     return m_cssomWrapper.get();
 }
 
 
 COMPILE_ASSERT(sizeof(ElementRareData) == sizeof(SameSizeAsElementRareData), ElementRareDataShouldStaySmall);
 
 } // namespace WebCore