Allow assertions to be enabled in Blink Release builds.

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2767 matching lines @@
         case SpellcheckAttributeFalse:
             return false;
         case SpellcheckAttributeDefault:
             break;
         }
     }
 
     return true;
 }
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
 bool Element::fastAttributeLookupAllowed(const QualifiedName& name) const
 {
     if (name == HTMLNames::styleAttr)
         return false;
 
     if (isSVGElement())
         return !toSVGElement(this)->isAnimatableAttribute(name);
 
     return true;
 }
@@ skipping 569 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace WebCore