Bug 1107443 part 4. Fix JS engine tests that define non-configurable properties on the window without meaning to. r=jorendorff

js/src/tests/ecma_5/Object/vacuous-accessor-unqualified-name.js

@@ -16,7 +16,7 @@ print(BUGNUMBER + ": " + summary);
  * BEGIN TEST *
  **************/
 
-Object.defineProperty(this, "x", { set: undefined });
+Object.defineProperty(this, "x", { set: undefined, configurable: true });
 x;
 
 /******************************************************************************/

js/src/tests/ecma_6/Proxy/regress-bug1037770.js

@@ -1,5 +1,5 @@
 foo = 1;
-Object.defineProperty(this, "foo", {writable:false});
+Object.defineProperty(this, "foo", {writable:false, configurable:true});
 foo = 2;
 assertEq(foo, 1);
 

js/src/tests/js1_8_5/extensions/watch-undefined-setter.js

@@ -14,6 +14,6 @@ var summary =
   '[@ js_GetClassPrototype]';
 
 this.watch("x", function() { });
-Object.defineProperty(this, "x", { set: undefined });
+Object.defineProperty(this, "x", { set: undefined, configurable: true });
 
 reportCompare(true, true);