Allow assertions to be enabled in Blink Release builds.

Source/core/svg/SVGElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 112 matching lines @@
     SVGUseElement* correspondingUseElement() const;
 
     void synchronizeAnimatedSVGAttribute(const QualifiedName&) const;
 
     virtual PassRefPtr<RenderStyle> customStyleForRenderer() OVERRIDE FINAL;
 
     virtual void synchronizeRequiredFeatures() { }
     virtual void synchronizeRequiredExtensions() { }
     virtual void synchronizeSystemLanguage() { }
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     virtual bool isAnimatableAttribute(const QualifiedName&) const;
 #endif
 
     MutableStylePropertySet* animatedSMILStyleProperties() const;
     MutableStylePropertySet* ensureAnimatedSMILStyleProperties();
     void setUseOverrideComputedStyle(bool);
 
     virtual bool haveLoadedRequiredResources();
 
     virtual bool addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture = false) OVERRIDE FINAL;
@@ skipping 114 matching lines @@
     static bool equal(const QualifiedName& a, const QualifiedName& b) { return a.matches(b); }
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(SVGElement, isSVGElement());
 
 template <> inline bool isElementOfType<const SVGElement>(const Node& node) { return node.isSVGElement(); }
 
 }
 
 #endif