Allow assertions to be enabled in Blink Release builds.

Source/wtf/DefaultAllocator.h

 /*
  * Copyright (C) 2013 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 100 matching lines @@
     static void registerWeakMembers(...)
     {
         ASSERT_NOT_REACHED();
     }
 
     static void registerWeakTable(...)
     {
         ASSERT_NOT_REACHED();
     }
 
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     static bool weakTableRegistered(...)
     {
         ASSERT_NOT_REACHED();
         return false;
     }
 #endif
 
     template<typename T, typename Traits>
     static void trace(...)
     {
@@ skipping 41 matching lines @@
     { \
         ASSERT(location); \
         return location; \
     } \
 private: \
 typedef int __thisIsHereToForceASemicolonAfterThisMacro
 
 using WTF::DefaultAllocator;
 
 #endif // WTF_DefaultAllocator_h