Allow assertions to be enabled in Blink Release builds.

Source/core/dom/Element.h

 /*
  * 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)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 114 matching lines @@
     void setIntegralAttribute(const QualifiedName& attributeName, int value);
     unsigned getUnsignedIntegralAttribute(const QualifiedName& attributeName) const;
     void setUnsignedIntegralAttribute(const QualifiedName& attributeName, unsigned value);
     double getFloatingPointAttribute(const QualifiedName& attributeName, double fallbackValue = std::numeric_limits<double>::quiet_NaN()) const;
     void setFloatingPointAttribute(const QualifiedName& attributeName, double value);
 
     // Call this to get the value of an attribute that is known not to be the style
     // attribute or one of the SVG animatable attributes.
     bool fastHasAttribute(const QualifiedName&) const;
     const AtomicString& fastGetAttribute(const QualifiedName&) const;
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     bool fastAttributeLookupAllowed(const QualifiedName&) const;
 #endif
 
 #ifdef DUMP_NODE_STATISTICS
     bool hasNamedNodeMap() const;
 #endif
     bool hasAttributes() const;
     // This variant will not update the potentially invalid attributes. To be used when not interested
     // in style attribute or one of the SVG animation attributes.
     bool hasAttributesWithoutUpdate() const;
@@ skipping 723 matching lines @@
     static PassRefPtrWillBeRawPtr<T> create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
     PassRefPtrWillBeRawPtr<T> T::create(const QualifiedName& tagName, Document& document) \
     { \
         return adoptRefWillBeNoop(new T(tagName, document)); \
     }
 
 } // namespace
 
 #endif