Revert of [stubs] Fix TypeOfStub to properly return "undefined" for undetectable.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 15cb651909b925663ede878e940e73775e298816..fba07af8659806631fcf72a5ec218058fb0554b3 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -11651,54 +11651,6 @@
     CHECK(instance->IsCallable());
     CHECK(!try_catch.HasCaught());
   }
-}
-
-
-THREADED_TEST(Regress567998) {
-  LocalContext env;
-  v8::HandleScope scope(env->GetIsolate());
-
-  Local<v8::FunctionTemplate> desc =
-      v8::FunctionTemplate::New(env->GetIsolate());
-  desc->InstanceTemplate()->MarkAsUndetectable();  // undetectable
-  desc->InstanceTemplate()->SetCallAsFunctionHandler(ReturnThis);  // callable
-
-  Local<v8::Object> obj = desc->GetFunction(env.local())
-                              .ToLocalChecked()
-                              ->NewInstance(env.local())
-                              .ToLocalChecked();
-  CHECK(
-      env->Global()->Set(env.local(), v8_str("undetectable"), obj).FromJust());
-
-  ExpectString("undetectable.toString()", "[object Object]");
-  ExpectString("typeof undetectable", "undefined");
-  ExpectString("typeof(undetectable)", "undefined");
-  ExpectBoolean("typeof undetectable == 'undefined'", true);
-  ExpectBoolean("typeof undetectable == 'object'", false);
-  ExpectBoolean("if (undetectable) { true; } else { false; }", false);
-  ExpectBoolean("!undetectable", true);
-
-  ExpectObject("true&&undetectable", obj);
-  ExpectBoolean("false&&undetectable", false);
-  ExpectBoolean("true||undetectable", true);
-  ExpectObject("false||undetectable", obj);
-
-  ExpectObject("undetectable&&true", obj);
-  ExpectObject("undetectable&&false", obj);
-  ExpectBoolean("undetectable||true", true);
-  ExpectBoolean("undetectable||false", false);
-
-  ExpectBoolean("undetectable==null", true);
-  ExpectBoolean("null==undetectable", true);
-  ExpectBoolean("undetectable==undefined", true);
-  ExpectBoolean("undefined==undetectable", true);
-  ExpectBoolean("undetectable==undetectable", true);
-
-  ExpectBoolean("undetectable===null", false);
-  ExpectBoolean("null===undetectable", false);
-  ExpectBoolean("undetectable===undefined", false);
-  ExpectBoolean("undefined===undetectable", false);
-  ExpectBoolean("undetectable===undetectable", true);
 }