Remove execScript from V8. No longer present i neither Firefox nor Safari.

test/mjsunit/function-names.js

 // Copyright 2008 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:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 110 matching lines @@
 
 TestFunctionNames(String.prototype, stringPrototypeFunctions);
 
 
 // Global functions.
 var globalFunctions = [
     "escape", "unescape", "decodeURI", "decodeURIComponent",
     "encodeURI", "encodeURIComponent", "Error", "TypeError",
     "RangeError", "SyntaxError", "ReferenceError", "EvalError",
     "URIError", "isNaN", "isFinite", "parseInt", "parseFloat",
-    "eval", "execScript"];
+    "eval"];
 
 TestFunctionNames(this, globalFunctions);