Fix http://code.google.com/p/chromium/issues/detail?id=1717...

src/math.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 144 matching lines @@
                DONT_ENUM |  DONT_DELETE | READ_ONLY);
   %SetProperty($Math,
                "SQRT1_2",
                0.7071067811865476,
                DONT_ENUM |  DONT_DELETE | READ_ONLY);
   %SetProperty($Math,
                "SQRT2",
                1.4142135623730951,
                DONT_ENUM |  DONT_DELETE | READ_ONLY);
 
-  // Setup non-enumerable functions of the Math object and
-  // set their names.
-  InstallFunctions($Math, DONT_ENUM, $Array(
+  // Setup non-enumerable functions of the Math object and set their names.  Use
+  // DONT_DELETE due to  http://code.google.com/p/chromium/issues/detail?id=1717
+  InstallFunctions($Math, DONT_ENUM | DONT_DELETE, $Array(
     "random", MathRandom,
     "abs", MathAbs,
     "acos", MathAcos,
     "asin", MathAsin,
     "atan", MathAtan,
     "ceil", MathCeil,
     "cos", MathCos,
     "exp", MathExp,
     "floor", MathFloor,
     "log", MathLog,
     "round", MathRound,
     "sin", MathSin,
     "sqrt", MathSqrt,
     "tan", MathTan,
     "atan2", MathAtan2,
     "pow", MathPow,
     "max", MathMax,
     "min", MathMin
   ));
 };
 
 
 SetupMath();