This change removes the %AddProperty native JavaScript function from V8....

src/date-delay.js

 // Copyright 2006-2008 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 941 matching lines @@
 
 function SetupDate() {
   // Setup non-enumerable properties of the Date object itself.
   InstallFunctions($Date, DONT_ENUM, $Array(
     "UTC", DateUTC,
     "parse", DateParse,
     "now", DateNow
   ));
 
   // Setup non-enumerable constructor property of the Date prototype object.
-  %AddProperty($Date.prototype, "constructor", $Date, DONT_ENUM);
+  %SetProperty($Date.prototype, "constructor", $Date, DONT_ENUM);
 
   // Setup non-enumerable functions of the Date prototype object and
   // set their names.
   InstallFunctions($Date.prototype, DONT_ENUM, $Array(
     "toString", DateToString,
     "toDateString", DateToDateString,
     "toTimeString", DateToTimeString,
     "toLocaleString", DateToLocaleString,
     "toLocaleDateString", DateToLocaleDateString,
     "toLocaleTimeString", DateToLocaleTimeString,
@@ skipping 32 matching lines @@
     "setFullYear", DateSetFullYear,
     "setUTCFullYear", DateSetUTCFullYear,
     "toGMTString", DateToGMTString,
     "toUTCString", DateToUTCString,
     "getYear", DateGetYear,
     "setYear", DateSetYear
   ));
 }
 
 SetupDate();