revert the cross site test which can't be done in core

Author: leirocks

test/es6/proxyenumremoval.js

@@ -115,17 +115,6 @@ for(var key in proxy){ keys += key;}
 passed &= keys==="b";
 passed &= getPrototypeOfCalled===1;
 
-// cross site marshal
-var IntArr0 = Array();
-IntArr0[3] = -6869070206472090000;
-IntArr0 = new Proxy(IntArr0, {});
-var sc1 = WScript.LoadScript('', 'samethread');
-sc1.IntArr0 = IntArr0;
-var sc1_cctx = sc1.Debug.parseFunction('x=""; for (var _strvar0 in IntArr0) {x+=IntArr0[_strvar0];}');
-sc1_cctx();
-passed &= (sc1.x=="-6869070206472090000");
-
-
 if (passed) {
   WScript.Echo("PASS");
 }