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

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 1124 matching lines @@
     if (renderer()) {
         RenderStyle* style = renderer()->style();
         // We allow selections to begin within an element that has -webkit-user-select: none set,
         // but if the element is draggable then dragging should take priority over selection.
         if (style->userDrag() == DRAG_ELEMENT && style->userSelect() == SELECT_NONE)
             return false;
     }
     return parentOrShadowHostNode() ? parentOrShadowHostNode()->canStartSelection() : true;
 }
 
-bool Node::isRegisteredWithNamedFlow() const
-{
-    return document().renderView()->flowThreadController()->isContentNodeRegisteredWithAnyNamedFlow(this);
-}
-
 Element* Node::shadowHost() const
 {
     if (ShadowRoot* root = containingShadowRoot())
         return root->host();
     return 0;
 }
 
 Node* Node::deprecatedShadowAncestorNode() const
 {
     if (ShadowRoot* root = containingShadowRoot())
@@ skipping 1398 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif