[builtins] Migrate Object.getOwnPropertyDescriptor to C++.

src/runtime/runtime-object.cc

Index: src/runtime/runtime-object.cc
diff --git a/src/runtime/runtime-object.cc b/src/runtime/runtime-object.cc
index d5e57562551a8944b11cc613909bd349c03ac9be..9d0b4d17eb134bde88aa96ec687ae9b94a6a70cc 100644
--- a/src/runtime/runtime-object.cc
+++ b/src/runtime/runtime-object.cc
@@ -266,31 +266,6 @@ RUNTIME_FUNCTION(Runtime_GetOwnProperty_Legacy) {
 }
 
 
-// ES6 19.1.2.6
-RUNTIME_FUNCTION(Runtime_GetOwnProperty) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, raw_name, 1);
-  // 1. Let obj be ? ToObject(O).
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, object,
-                                     Object::ToObject(isolate, object));
-  // 2. Let key be ? ToPropertyKey(P).
-  Handle<Name> key;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, key,
-                                     Object::ToName(isolate, raw_name));
-
-  // 3. Let desc be ? obj.[[GetOwnProperty]](key).
-  PropertyDescriptor desc;
-  Maybe<bool> found = JSReceiver::GetOwnPropertyDescriptor(
-      isolate, Handle<JSReceiver>::cast(object), key, &desc);
-  MAYBE_RETURN(found, isolate->heap()->exception());
-  // 4. Return FromPropertyDescriptor(desc).
-  if (!found.FromJust()) return isolate->heap()->undefined_value();
-  return *desc.ToObject(isolate);
-}
-
-
 RUNTIME_FUNCTION(Runtime_OptimizeObjectForAddingMultipleProperties) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);