Allow assertions to be enabled in Blink Release builds.

Source/core/xml/XPathStep.cpp

 /*
  * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * 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
@@ skipping 136 matching lines @@
             evaluationContext.size = nodes.size();
             evaluationContext.position = j + 1;
             if (predicate->evaluate(evaluationContext))
                 newNodes->append(node);
         }
 
         nodes.swap(*newNodes);
     }
 }
 
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
 static inline Node::NodeType primaryNodeType(Step::Axis axis)
 {
     switch (axis) {
     case Step::AttributeAxis:
         return Node::ATTRIBUTE_NODE;
     default:
         return Node::ELEMENT_NODE;
     }
 }
 #endif
@@ skipping 266 matching lines @@
         nodes.markSorted(false);
         return;
     }
     }
     ASSERT_NOT_REACHED();
 }
 
 }
 
 }