Remove CSS_REGIONS compile flag from Blink.

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 1093 matching lines @@
 bool Document::cssCompositingEnabled() const
 {
     return RuntimeEnabledFeatures::cssCompositingEnabled();
 }
 
 bool Document::cssGridLayoutEnabled() const
 {
     return settings() && settings()->cssGridLayoutEnabled();
 }
 
-#if ENABLE(CSS_REGIONS)
-
 PassRefPtr<DOMNamedFlowCollection> Document::webkitGetNamedFlows()
 {
     if (!cssRegionsEnabled() || !renderer())
         return 0;
 
     updateStyleIfNeeded();
 
     return namedFlows()->createCSSOMSnapshot();
 }
 
-#endif
-
 NamedFlowCollection* Document::namedFlows()
 {
     if (!m_namedFlows)
         m_namedFlows = NamedFlowCollection::create(this);
 
     return m_namedFlows.get();
 }
 
 PassRefPtr<Element> Document::createElementNS(const String& namespaceURI, const String& qualifiedName, ExceptionCode& ec)
 {
@@ skipping 4590 matching lines @@
         return;
 
     Vector<RefPtr<Element> > associatedFormControls;
     copyToVector(m_associatedFormControls, associatedFormControls);
 
     frame()->page()->chrome()->client()->didAssociateFormControls(associatedFormControls);
     m_associatedFormControls.clear();
 }
 
 } // namespace WebCore