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

Source/core/dom/Node.h

 /*
  * 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, 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
  * License as published by the Free Software Foundation; either
@@ skipping 244 matching lines @@
     // since those elements will never have class names, inline style, or other things that
     // this apparently guards against.
     bool isStyledElement() const { return isHTMLElement() || isSVGElement(); }
 
     bool isDocumentNode() const;
     bool isTreeScope() const { return &treeScope().rootNode() == this; }
     bool isDocumentFragment() const { return getFlag(IsDocumentFragmentFlag); }
     bool isShadowRoot() const { return isDocumentFragment() && isTreeScope(); }
     bool isInsertionPoint() const { return getFlag(IsInsertionPointFlag); }
 
-    bool inNamedFlow() const { return getFlag(InNamedFlowFlag); }
     bool hasCustomStyleCallbacks() const { return getFlag(HasCustomStyleCallbacksFlag); }
 
-    bool isRegisteredWithNamedFlow() const;
-
     bool hasSyntheticAttrChildNodes() const { return getFlag(HasSyntheticAttrChildNodesFlag); }
     void setHasSyntheticAttrChildNodes(bool flag) { setFlag(flag, HasSyntheticAttrChildNodesFlag); }
 
     // If this node is in a shadow tree, returns its shadow host. Otherwise, returns 0.
     Element* shadowHost() const;
     // If this node is in a shadow tree, returns its shadow host. Otherwise, returns this.
     // Deprecated. Should use shadowHost() and check the return value.
     Node* deprecatedShadowAncestorNode() const;
     ShadowRoot* containingShadowRoot() const;
     ShadowRoot* youngestShadowRoot() const;
@@ skipping 94 matching lines @@
     void markAncestorsWithChildNeedsStyleInvalidation();
     bool needsStyleInvalidation() { return getFlag(NeedsStyleInvalidation); }
     void setNeedsStyleInvalidation();
 
     void recalcDistribution();
 
     bool shouldNotifyRendererWithIdenticalStyles() const { return getFlag(NotifyRendererWithIdenticalStyles); }
 
     void setIsLink(bool f);
 
-    void setInNamedFlow() { setFlag(InNamedFlowFlag); }
-    void clearInNamedFlow() { clearFlag(InNamedFlowFlag); }
-
     bool hasScopedHTMLStyleChild() const { return getFlag(HasScopedHTMLStyleChildFlag); }
     void setHasScopedHTMLStyleChild(bool flag) { setFlag(flag, HasScopedHTMLStyleChildFlag); }
 
     bool hasEventTargetData() const { return getFlag(HasEventTargetDataFlag); }
     void setHasEventTargetData(bool flag) { setFlag(flag, HasEventTargetDataFlag); }
 
     bool isV8CollectableDuringMinorGC() const { return getFlag(V8CollectableDuringMinorGCFlag); }
     void markV8CollectableDuringMinorGC() { setFlag(true, V8CollectableDuringMinorGCFlag); }
     void clearV8CollectableDuringMinorGC() { setFlag(false, V8CollectableDuringMinorGCFlag); }
 
@@ skipping 301 matching lines @@
         IsFinishedParsingChildrenFlag = 1 << 12, // Element
 
         AlreadySpellCheckedFlag = 1 << 13,
 
         StyleChangeMask = 1 << nodeStyleChangeShift | 1 << (nodeStyleChangeShift + 1),
 
         SelfOrAncestorHasDirAutoFlag = 1 << 16,
 
         HasNameOrIsEditingTextFlag = 1 << 17,
 
-        InNamedFlowFlag = 1 << 18,
+        // Bit 18 is available
+
         HasSyntheticAttrChildNodesFlag = 1 << 19,
         HasCustomStyleCallbacksFlag = 1 << 20,
         HasScopedHTMLStyleChildFlag = 1 << 21,
         HasEventTargetDataFlag = 1 << 22,
         V8CollectableDuringMinorGCFlag = 1 << 23,
         IsInsertionPointFlag = 1 << 24,
         IsInShadowTreeFlag = 1 << 25,
 
         NotifyRendererWithIdenticalStyles = 1 << 26,
 
         CustomElement = 1 << 27,
         CustomElementUpgraded = 1 << 28,
 
         ChildNeedsStyleInvalidation = 1 << 29,
         NeedsStyleInvalidation = 1 << 30,
 
         DefaultNodeFlags = IsFinishedParsingChildrenFlag | ChildNeedsStyleRecalcFlag | NeedsReattachStyleChange
     };
 
-    // 2 bits remaining.
+    // 3 bits remaining.
 
     bool getFlag(NodeFlags mask) const { return m_nodeFlags & mask; }
     void setFlag(bool f, NodeFlags mask) const { m_nodeFlags = (m_nodeFlags & ~mask) | (-(int32_t)f & mask); }
     void setFlag(NodeFlags mask) const { m_nodeFlags |= mask; }
     void clearFlag(NodeFlags mask) const { m_nodeFlags &= ~mask; }
 
 protected:
     enum ConstructionType {
         CreateOther = DefaultNodeFlags,
         CreateText = DefaultNodeFlags | IsTextFlag,
@@ skipping 171 matching lines @@
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::Node*);
 void showNodePath(const WebCore::Node*);
 #endif
 
 #endif