Allow assertions to be enabled in Blink Release builds.

Source/core/xml/XPathNodeSet.cpp

 /*
  * 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
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 126 matching lines @@
             for (unsigned i = groupEnd; i < to; ++i) {
                 if (parentWithDepth(commonAncestorDepth + 1, parentMatrix[i]) == n)
                     parentMatrix[i].swap(parentMatrix[groupEnd++]);
             }
 
             if (groupEnd - previousGroupEnd > 1)
                 sortBlock(previousGroupEnd, groupEnd, parentMatrix, mayContainAttributeNodes);
 
             ASSERT(previousGroupEnd != groupEnd);
             previousGroupEnd = groupEnd;
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
             parentNodes.remove(n);
 #endif
         }
     }
 
     ASSERT(parentNodes.isEmpty());
 }
 
 void NodeSet::sort() const
 {
@@ skipping 120 matching lines @@
 Node* NodeSet::anyNode() const
 {
     if (isEmpty())
         return 0;
 
     return m_nodes.at(0).get();
 }
 
 }
 }