Allow assertions to be enabled in Blink Release builds.

Source/bindings/core/v8/npruntime.cpp

 /*
  * Copyright (C) 2004, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2007-2009 Google, Inc.  All rights reserved.
  *
  * 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 403 matching lines @@
 
     NPObject* owner = 0;
     if (liveObjectMap().find(npObject) != liveObjectMap().end())
         owner = liveObjectMap().find(npObject)->value;
 
     if (!owner) {
         // Unregistering a owner object; also unregister it's descendants.
         ASSERT_WITH_SECURITY_IMPLICATION(rootObjectMap().find(npObject) != rootObjectMap().end());
         NPObjectSet* set = rootObjectMap().get(npObject);
         while (set->size() > 0) {
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
             unsigned size = set->size();
 #endif
             NPObject* sub_object = *(set->begin());
             // The sub-object should not be a owner!
             ASSERT(rootObjectMap().find(sub_object) == rootObjectMap().end());
 
             // First, unregister the object.
             set->remove(sub_object);
             liveObjectMap().remove(sub_object);
 
@@ skipping 21 matching lines @@
     liveObjectMap().remove(npObject);
     forgetV8ObjectForNPObject(npObject);
 }
 
 bool _NPN_IsAlive(NPObject* npObject)
 {
     return liveObjectMap().find(npObject) != liveObjectMap().end();
 }
 
 } // extern "C"