Allow assertions to be enabled in Blink Release builds.

Source/bindings/core/v8/DOMWrapperWorld.cpp

 /*
  * Copyright (C) 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 104 matching lines @@
     map.remove(it);
     isolatedWorldCount--;
     ASSERT(map.size() == isolatedWorldCount);
 }
 
 void DOMWrapperWorld::dispose()
 {
     m_domDataStore.clear();
 }
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
 static bool isIsolatedWorldId(int worldId)
 {
     return MainWorldId < worldId  && worldId < IsolatedWorldIdLimit;
 }
 #endif
 
 PassRefPtr<DOMWrapperWorld> DOMWrapperWorld::ensureIsolatedWorld(int worldId, int extensionGroup)
 {
     ASSERT(isIsolatedWorldId(worldId));
 
@@ skipping 58 matching lines @@
 void DOMWrapperWorld::setIsolatedWorldContentSecurityPolicy(int worldId, const String& policy)
 {
     ASSERT(isIsolatedWorldId(worldId));
     if (!policy.isEmpty())
         isolatedWorldContentSecurityPolicies().set(worldId, true);
     else
         isolatedWorldContentSecurityPolicies().remove(worldId);
 }
 
 } // namespace WebCore