Allow assertions to be enabled in Blink Release builds.

Source/platform/heap/HeapTest.cpp

 /*
  * 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 258 matching lines @@
         ASSERT_NOT_REACHED();
     }
 
     virtual void markConservatively(FinalizedHeapObjectHeader* header) OVERRIDE
     {
         ASSERT_NOT_REACHED();
     }
 
     virtual void registerWeakMembers(const void*, const void*, WeakPointerCallback) OVERRIDE { }
     virtual void registerWeakTable(const void*, EphemeronCallback, EphemeronCallback) OVERRIDE { }
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
     virtual bool weakTableRegistered(const void*) OVERRIDE { return false; }
 #endif
     virtual void registerWeakCell(void**, WeakPointerCallback) OVERRIDE { }
     virtual bool isMarked(const void*) OVERRIDE { return false; }
 
     FOR_EACH_TYPED_HEAP(DEFINE_VISITOR_METHODS)
 
     size_t count() { return m_count; }
     void reset() { m_count = 0; }
 
@@ skipping 4545 matching lines @@
 };
 
 volatile uintptr_t DeadBitTester::s_workerObjectPointer = 0;
 
 TEST(HeapTest, ObjectDeadBit)
 {
     DeadBitTester::test();
 }
 
 } // WebCore namespace