Remove CSS_REGIONS compile flag from Blink.

Source/core/dom/DOMNamedFlowCollection.cpp

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 11 matching lines @@
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 #include "config.h"
 #include "core/dom/DOMNamedFlowCollection.h"
 
+#include "RuntimeEnabledFeatures.h"
 #include "core/dom/NamedFlow.h"
 #include "core/dom/NamedFlowCollection.h"
 
 namespace WebCore {
 
 DOMNamedFlowCollection::DOMNamedFlowCollection(const Vector<NamedFlow*>& namedFlows)
 {
+    ASSERT(RuntimeEnabledFeatures::cssRegionsEnabled());
     for (Vector<NamedFlow*>::const_iterator it = namedFlows.begin(); it != namedFlows.end(); ++it)
         m_namedFlows.add(*it);
 }
 
 unsigned long DOMNamedFlowCollection::length() const
 {
     return m_namedFlows.size();
 }
 
 PassRefPtr<NamedFlow> DOMNamedFlowCollection::item(unsigned long index) const
@@ skipping 29 matching lines @@
 
 // The HashTranslator is used to lookup a RefPtr<NamedFlow> in the set using a name.
 struct DOMNamedFlowCollection::DOMNamedFlowHashTranslator {
     static unsigned hash(const String& key) { return DefaultHash<String>::Hash::hash(key); }
     static bool equal(PassRefPtr<NamedFlow> a, const String& b) { return a->name() == b; }
 };
 } // namespace WebCore