Remove CSS regions support, keeping a bare minimum to support "region-based" multicol.

Source/core/rendering/RenderTable.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 288 matching lines @@
     void invalidateCachedColumns();
 
     virtual RenderBlock* firstLineBlock() const OVERRIDE;
     virtual void updateFirstLetter() OVERRIDE;
 
     virtual void updateLogicalWidth() OVERRIDE;
 
     LayoutUnit convertStyleLogicalWidthToComputedWidth(const Length& styleLogicalWidth, LayoutUnit availableWidth);
     LayoutUnit convertStyleLogicalHeightToComputedHeight(const Length& styleLogicalHeight);
 
-    virtual LayoutRect overflowClipRect(const LayoutPoint& location, RenderRegion*, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize) OVERRIDE;
+    virtual LayoutRect overflowClipRect(const LayoutPoint& location, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize) OVERRIDE;
 
     virtual void addOverflowFromChildren() OVERRIDE;
 
     void subtractCaptionRect(LayoutRect&) const;
 
     void recalcCollapsedBorders();
     void recalcSections() const;
     void layoutCaption(RenderTableCaption*);
 
     void distributeExtraLogicalHeight(int extraLogicalHeight);
@@ skipping 42 matching lines @@
     if (m_firstBody)
         return m_firstBody;
     return m_foot;
 }
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderTable, isTable());
 
 } // namespace WebCore
 
 #endif // RenderTable_h