Revert revision 7143, this causes a number of webkit tests to fail....

test/mjsunit/accessors-on-global-object.js

Index: test/mjsunit/accessors-on-global-object.js
===================================================================
--- test/mjsunit/accessors-on-global-object.js	(revision 7143)
+++ test/mjsunit/accessors-on-global-object.js	(working copy)
@@ -28,7 +28,7 @@
 // Test that installing a getter on the global object instead of a
 // normal property works.
 
-x = 0;
+var x = 0;
 
 function getX() { return x; }
 
@@ -41,7 +41,7 @@
 // Test that installing a setter on the global object instead of a
 // normal property works.
 
-y = 0;
+var y = 0;
 var setter_y;
 
 function setY(value) { y = value; }
@@ -67,6 +67,6 @@
   assertEquals(i < 5 ? 42 : 0, getZ());
   if (i == 4) {
     delete z;
-    z = 0;
+    var z = 0;
   }
 }