Replace tests of ASSERT_ENABLED with ENABLE(ASSERT).

Source/wtf/DateMath.cpp

 /*
  * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2007-2009 Torch Mobile, Inc.
  * Copyright (C) 2010 &yet, LLC. (nate@andyet.net)
  *
  * The Original Code is Mozilla Communicator client code, released
  * March 31, 1998.
  *
@@ skipping 436 matching lines @@
         int month = monthFromDayInYear(dayInYearLocal, leapYear);
         double day = dateToDaysFrom1970(equivalentYear, month, dayInMonth);
         ms = (day * msPerDay) + msToMilliseconds(ms);
     }
 
     return calculateDSTOffsetSimple(ms / msPerSecond, utcOffset);
 }
 
 void initializeDates()
 {
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
     static bool alreadyInitialized;
     ASSERT(!alreadyInitialized);
     alreadyInitialized = true;
 #endif
 
     equivalentYearForDST(2000); // Need to call once to initialize a static used in this function.
 }
 
 static inline double ymdhmsToSeconds(int year, long mon, long day, long hour, long minute, double second)
 {
@@ skipping 407 matching lines @@
 
     stringBuilder.append(utcOffset > 0 ? '+' : '-');
     int absoluteUTCOffset = abs(utcOffset);
     stringBuilder.append(twoDigitStringFromNumber(absoluteUTCOffset / 60));
     stringBuilder.append(twoDigitStringFromNumber(absoluteUTCOffset % 60));
 
     return stringBuilder.toString();
 }
 
 } // namespace WTF