Fix some usage of "this" in builtins

src/v8natives.js

 // Copyright 2006-2008 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 179 matching lines @@
 
 %SetProperty($Boolean.prototype, "constructor", $Boolean, DONT_ENUM);
 
 // ----------------------------------------------------------------------------
 // Object
 
 $Object.prototype.constructor = $Object;
 
 // ECMA-262 - 15.2.4.2
 function ObjectToString() {
-  return "[object " + %_ClassOf(this) + "]";
+  return "[object " + %_ClassOf(ToObject(this)) + "]";
 }
 
 
 // ECMA-262 - 15.2.4.3
 function ObjectToLocaleString() {
   return this.toString();
 }
 
 
 // ECMA-262 - 15.2.4.4
 function ObjectValueOf() {
-  return this;
+  return ToObject(this);
 }
 
 
 // ECMA-262 - 15.2.4.5
 function ObjectHasOwnProperty(V) {
   return %HasLocalProperty(ToObject(this), ToString(V));
 }
 
 
 // ECMA-262 - 15.2.4.6
@@ skipping 651 matching lines @@
 
 // ----------------------------------------------------------------------------
 
 function SetupFunction() {
   InstallFunctions($Function.prototype, DONT_ENUM, $Array(
     "toString", FunctionToString
   ));
 }
 
 SetupFunction();