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

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 59 matching lines @@
 class CSSStyleSheet;
 class CSSStyleSheetResource;
 class CanvasRenderingContext;
 class CharacterData;
 class Chrome;
 class Comment;
 class ContentSecurityPolicyResponseHeaders;
 class ContextFeatures;
 class CustomElementRegistrationContext;
 class DOMImplementation;
-class DOMNamedFlowCollection;
 class DOMSelection;
 class DOMWindow;
 class Database;
 class DatabaseThread;
 class DocumentFragment;
 class DocumentLifecycleNotifier;
 class DocumentLifecycleObserver;
 class DocumentLoader;
 class DocumentMarkerController;
 class DocumentParser;
@@ skipping 31 matching lines @@
 class JSNode;
 class LayoutPoint;
 class LayoutRect;
 class LiveNodeListBase;
 class Locale;
 class Location;
 class MainThreadTaskRunner;
 class MediaQueryList;
 class MediaQueryMatcher;
 class MouseEventWithHitTestResults;
-class NamedFlowCollection;
 class NodeFilter;
 class NodeIterator;
 class Page;
 class PlatformMouseEvent;
 class ProcessingInstruction;
 class Range;
 class RegisteredEventListener;
 class RenderView;
 class RequestAnimationFrameCallback;
 class ResourceFetcher;
@@ skipping 170 matching lines @@
     PassRefPtr<Text> createTextNode(const String& data);
     PassRefPtr<Comment> createComment(const String& data);
     PassRefPtr<CDATASection> createCDATASection(const String& data, ExceptionState&);
     PassRefPtr<ProcessingInstruction> createProcessingInstruction(const String& target, const String& data, ExceptionState&);
     PassRefPtr<Attr> createAttribute(const AtomicString& name, ExceptionState&);
     PassRefPtr<Node> importNode(Node* importedNode, ExceptionState& ec) { return importNode(importedNode, true, ec); }
     PassRefPtr<Node> importNode(Node* importedNode, bool deep, ExceptionState&);
     PassRefPtr<Element> createElementNS(const AtomicString& namespaceURI, const AtomicString& qualifiedName, ExceptionState&);
     PassRefPtr<Element> createElement(const QualifiedName&, bool createdByParser);
 
-    PassRefPtr<DOMNamedFlowCollection> webkitGetNamedFlows();
-
-    NamedFlowCollection* namedFlows();
-
     bool regionBasedColumnsEnabled() const;
 
     /**
      * Retrieve all nodes that intersect a rect in the window's document, until it is fully enclosed by
      * the boundaries of a node.
      *
      * @param centerX x reference for the rectangle in CSS pixels
      * @param centerY y reference for the rectangle in CSS pixels
      * @param topPadding How much to expand the top of the rectangle
      * @param rightPadding How much to expand the right of the rectangle
@@ skipping 977 matching lines @@
 
     double m_lastHandledUserGestureTimestamp;
 
     RefPtr<ScriptedAnimationController> m_scriptedAnimationController;
     OwnPtr<MainThreadTaskRunner> m_taskRunner;
     OwnPtr<TextAutosizer> m_textAutosizer;
     OwnPtr<FastTextAutosizer> m_fastTextAutosizer;
 
     RefPtr<CustomElementRegistrationContext> m_registrationContext;
 
-    RefPtr<NamedFlowCollection> m_namedFlows;
-
     void elementDataCacheClearTimerFired(Timer<Document>*);
     Timer<Document> m_elementDataCacheClearTimer;
 
     OwnPtr<ElementDataCache> m_elementDataCache;
 
 #ifndef NDEBUG
     bool m_didDispatchViewportPropertiesChanged;
 #endif
 
     typedef HashMap<AtomicString, OwnPtr<Locale> > LocaleIdentifierToLocaleMap;
@@ skipping 51 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == document();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h