Introduce ASSERT_ENABLED macro.

Source/wtf/StringHasher.h

 /*
  * Copyright (C) 2005, 2006, 2008, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 56 matching lines @@
             return;
         }
 
         m_pendingCharacter = character;
         m_hasPendingCharacter = true;
     }
 
     void addCharacters(UChar a, UChar b)
     {
         if (m_hasPendingCharacter) {
-#if !ASSERT_DISABLED
+#if ASSERT_ENABLED
             m_hasPendingCharacter = false;
 #endif
             addCharactersAssumingAligned(m_pendingCharacter, a);
             m_pendingCharacter = b;
-#if !ASSERT_DISABLED
+#if ASSERT_ENABLED
             m_hasPendingCharacter = true;
 #endif
             return;
         }
 
         addCharactersAssumingAligned(a, b);
     }
 
     template<typename T, UChar Converter(T)> void addCharactersAssumingAligned(const T* data, unsigned length)
     {
@@ skipping 194 matching lines @@
     unsigned m_hash;
     bool m_hasPendingCharacter;
     UChar m_pendingCharacter;
 };
 
 } // namespace WTF
 
 using WTF::StringHasher;
 
 #endif // WTF_StringHasher_h