Implement ES5 erratum: global declarations shadow inherited properties.

test/mjsunit/regress/regress-1119.js

Index: test/mjsunit/regress/regress-1119.js
diff --git a/test/mjsunit/regress/regress-1119.js b/test/mjsunit/regress/regress-1119.js
index 16b2e4f93578d449b830e24538c44967954a0eda..44fc3f5baf879f683f38693a51c83d0cbc20de6f 100644
--- a/test/mjsunit/regress/regress-1119.js
+++ b/test/mjsunit/regress/regress-1119.js
@@ -28,8 +28,8 @@
 // Test runtime declaration of properties with var which are intercepted
 // by JS accessors.
 
-__proto__.__defineSetter__("x", function() { hasBeenInvoked = true; });
-__proto__.__defineSetter__("y", function() { throw 'exception'; });
+this.__defineSetter__("x", function() { hasBeenInvoked = true; });
+this.__defineSetter__("y", function() { throw 'exception'; });
 
 var hasBeenInvoked = false;
 eval("try { } catch (e) { var x = false; }");