Introduce ASSERT_ENABLED macro.

Source/core/dom/TreeShared.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2012 Apple Inc. All rights reserved.
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 21 matching lines @@
 template<typename NodeType> void adopted(TreeShared<NodeType>*);
 #endif
 
 template<typename NodeType> class TreeShared {
     WTF_MAKE_NONCOPYABLE(TreeShared);
 protected:
     TreeShared()
         : m_refCount(1)
 #if SECURITY_ASSERT_ENABLED
         , m_deletionHasBegun(false)
-#if !ASSERT_DISABLED
+#if ASSERT_ENABLED
         , m_inRemovedLastRefFunction(false)
         , m_adoptionIsRequired(true)
 #endif
 #endif
     {
         ASSERT(isMainThread());
     }
 
     ~TreeShared()
     {
@@ skipping 33 matching lines @@
     {
         return m_refCount;
     }
 
 private:
     int m_refCount;
 
 #if SECURITY_ASSERT_ENABLED
 public:
     bool m_deletionHasBegun;
-#if !ASSERT_DISABLED
+#if ASSERT_ENABLED
     bool m_inRemovedLastRefFunction;
 
 private:
     friend void adopted<>(TreeShared<NodeType>*);
     bool m_adoptionIsRequired;
 #endif
 #endif
 };
 
 #if SECURITY_ASSERT_ENABLED
 template<typename NodeType> inline void adopted(TreeShared<NodeType>* object)
 {
     if (!object)
         return;
     ASSERT_WITH_SECURITY_IMPLICATION(!object->m_deletionHasBegun);
 #if !ASSERT_DISABLED
     ASSERT(!object->m_inRemovedLastRefFunction);
     object->m_adoptionIsRequired = false;
 #endif
 }
 #endif
 
 }
 
 #endif // TreeShared.h