Revert "Clean up after r16292 (disable optimization for StringWrappers)."

test/mjsunit/regress/regress-2855.js

Index: test/mjsunit/regress/regress-2855.js
diff --git a/test/mjsunit/regress/regress-2855.js b/test/mjsunit/regress/regress-2855.js
index 24ec452d5994505c2db68476a0a946155f731bae..ac721af73bf4c91ecc751fc31a3db91cf6942c93 100644
--- a/test/mjsunit/regress/regress-2855.js
+++ b/test/mjsunit/regress/regress-2855.js
@@ -39,19 +39,3 @@ for (var i = 0; i < 4; ++i) {
   }
   assertEquals(expected, "" + foo("hello"));
 }
-
-// Make sure we look up "valueOf" only once.
-var count = 0;
-var x = new String("foo");
-Object.defineProperty(x, "valueOf",
-    { get: function() {
-             count++;
-             return function() {
-                      return 11;
-                    }
-           }
-    });
-for (var i = 0; i < 3; i++) {
-  assertEquals("11", "" + x);
-  assertEquals(i + 1, count);
-}