Allow assertions to be enabled in Blink Release builds.

Source/core/dom/TreeScope.h

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 142 matching lines @@
 #endif
 
     void setNeedsStyleRecalcForViewportUnits();
 
 private:
     virtual void dispose() { }
 
 #if !ENABLE(OILPAN)
     int refCount() const;
 
-#if SECURITY_ASSERT_ENABLED
+#if ENABLE(SECURITY_ASSERT)
     bool deletionHasBegun();
     void beginDeletion();
 #else
     bool deletionHasBegun() { return false; }
     void beginDeletion() { }
 #endif
 #endif
 
     bool rootNodeHasTreeSharedParent() const;
 
@@ skipping 26 matching lines @@
 }
 
 DEFINE_COMPARISON_OPERATORS_WITH_REFERENCES(TreeScope)
 
 HitTestResult hitTestInDocument(const Document*, int x, int y);
 TreeScope* commonTreeScope(Node*, Node*);
 
 } // namespace WebCore
 
 #endif // TreeScope_h