Revert Enable new multicol for testing and experimental web platform features.

Source/core/dom/Document.cpp

 /*
  * 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, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 1063 matching lines @@
         e = Element::create(qName, this);
 
     if (e->prefix() != qName.prefix())
         e->setTagNameForCreateElementNS(qName);
 
     ASSERT(qName == e->tagQName());
 
     return e.release();
 }
 
+bool Document::regionBasedColumnsEnabled() const
+{
+    return settings() && settings()->regionBasedColumnsEnabled();
+}
+
 String Document::readyState() const
 {
     DEFINE_STATIC_LOCAL(const String, loading, ("loading"));
     DEFINE_STATIC_LOCAL(const String, interactive, ("interactive"));
     DEFINE_STATIC_LOCAL(const String, complete, ("complete"));
 
     switch (m_readyState) {
     case Loading:
         return loading;
     case Interactive:
@@ skipping 4605 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif