Reverted 3551 from trunk.

src/v8natives.js

Index: src/v8natives.js
===================================================================
--- src/v8natives.js	(revision 3551)
+++ src/v8natives.js	(working copy)
@@ -449,15 +449,6 @@
 
 
 // ES5 section 15.2.3.5.
-function ObjectGetPrototypeOf(obj) {
-  if (!(IS_OBJECT(obj) || IS_FUNCTION(obj))) {
-    throw MakeTypeError("object_get_prototype_non_object", [obj]);
-  }
-  return obj.__proto__;
-}
-
-
-// ES5 section 15.2.3.5.
 function ObjectCreate(proto, properties) {
   if (!IS_OBJECT(proto) && !IS_NULL(proto)) {
     throw MakeTypeError("proto_object_or_null", [proto]);
@@ -521,8 +512,7 @@
   ));
   InstallFunctions($Object, DONT_ENUM, $Array(
     "keys", ObjectKeys,
-    "create", ObjectCreate,
-    "getPrototypeOf", ObjectGetPrototypeOf
+    "create", ObjectCreate
   ));
 }