Allow assertions to be enabled in Blink Release builds.

Source/platform/LayoutUnit.h

 /*
  * Copyright (c) 2012, 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 22 matching lines @@
 
 #include "wtf/Assertions.h"
 #include "wtf/MathExtras.h"
 #include "wtf/SaturatedArithmetic.h"
 #include <limits.h>
 #include <limits>
 #include <stdlib.h>
 
 namespace WebCore {
 
-#ifdef NDEBUG
+#if !ERROR_DISABLED
 
 #define REPORT_OVERFLOW(doesOverflow) ((void)0)
 
 #else
 
 #define REPORT_OVERFLOW(doesOverflow) do \
     if (!(doesOverflow)) { \
         WTFReportError(__FILE__, __LINE__, WTF_PRETTY_FUNCTION, "!(%s)", #doesOverflow); \
     } \
 while (0)
@@ skipping 734 matching lines @@
     if (value >= max)
         return max;
     if (value <= min)
         return min;
     return value;
 }
 
 } // namespace WebCore
 
 #endif // LayoutUnit_h