Remove variable rewrites and the unneccesary Slot class.

test/mjsunit/compiler/delete.js

Index: test/mjsunit/compiler/delete.js
diff --git a/test/mjsunit/compiler/delete.js b/test/mjsunit/compiler/delete.js
index 373a1cbcf3631eee57c599eba63f0c1d3285bba8..2aaecb25b6b9cde5804f4ae8d9e35b47c28b3bce 100644
--- a/test/mjsunit/compiler/delete.js
+++ b/test/mjsunit/compiler/delete.js
@@ -1,4 +1,4 @@
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 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:
@@ -66,6 +66,7 @@ assertEquals(2, ((delete 0) || 2) + 1);
 assertEquals(3, (function (x) { return ((delete x) || 2) + 1; })(0));
 
 
-// 'this' at toplevel is different from all other global variables---not
-// deletable.
+// 'this' is not a Reference so delete returns true (see section 11.4.1,
+// step 2 of ES 5.1).
 assertEquals(true, delete this);
+assertEquals(true, (function () { return delete this; })());