Introduce DefineOwnPropertyIgnoreAttributes and make it call SetPropertyWithInterceptor

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index ac3934155ddfb27ec4ce86e739203d3baa25f4c5..e8e4b20074963054f9a5d6211000f2c48fb9971a 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -5078,11 +5078,19 @@ MaybeHandle<Object> JSObject::DeletePropertyWithInterceptor(
 
   Handle<JSObject> holder = it->GetHolder<JSObject>();
 
+  // TODO(verwaest): Temporary workaround for blink pretending to delete
+  // elements that don't actually exist.
+  Maybe<PropertyAttributes> attributes =
+      GetPropertyAttributesWithInterceptor(it);
+  CHECK(attributes.IsJust());
+  if (attributes.FromJust() == ABSENT) return MaybeHandle<Object>();
+
   PropertyCallbackArguments args(isolate, interceptor->data(),
                                  *it->GetReceiver(), *holder);
   v8::Handle<v8::Boolean> result;
   if (it->IsElement()) {
     uint32_t index = it->index();
+

[Igor Sheludko, 2015/06/12 10:05:25]

Spurious change.

     v8::IndexedPropertyDeleterCallback deleter =
         v8::ToCData<v8::IndexedPropertyDeleterCallback>(interceptor->deleter());
     LOG(isolate,