Reverty 1842 (see http://code.google.com/p/chromium/issues/detail?id=1717 )

src/array.js

Index: src/array.js
===================================================================
--- src/array.js	(revision 1845)
+++ src/array.js	(working copy)
@@ -1011,10 +1011,9 @@
   // object.
   %SetProperty($Array.prototype, "constructor", $Array, DONT_ENUM);
 
-  // Setup non-enumerable functions of the Array.prototype object and set their
-  // names.  Use DONT_DELETE due to
-  // http://code.google.com/p/chromium/issues/detail?id=1717
-  InstallFunctions($Array.prototype, DONT_ENUM | DONT_DELETE, $Array(
+  // Setup non-enumerable functions of the Array.prototype object and
+  // set their names.
+  InstallFunctions($Array.prototype, DONT_ENUM, $Array(
     "toString", ArrayToString,
     "toLocaleString", ArrayToLocaleString,
     "join", ArrayJoin,