Revert "Pass undefined to JS builtins when called with implicit receiver."

test/mjsunit/regress/regress-485.js

 // Copyright 2009 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 16 matching lines @@
 
 // See: http://code.google.com/p/v8/issues/detail?id=485
 
 // Ensure that we don't expose the builtins object when calling
 // builtin functions that use or return "this".
 
 var global = this;
 var global2 = (function(){return this;})();
 assertEquals(global, global2, "direct call to local function returns global");
 
+var builtin = Object.prototype.valueOf;  // Builtin function that returns this.
+
+assertEquals(global, builtin(), "Direct call to builtin");
+
+
 // Builtin that depends on value of this to compute result.
 var builtin2 = Object.prototype.toString;
 
 // Global object has class "Object" according to Object.prototype.toString.
 // Builtins object displays as "[object builtins]".
 assertTrue("[object builtins]" != builtin2(), "Direct call to toString");
 assertTrue("[object builtins]" != builtin2.call(), "call() to toString");
 assertTrue("[object builtins]" != builtin2.apply(), "call() to toString");
 assertTrue("[object builtins]" != builtin2.call.call(builtin2),
            "call.call() to toString");