Node-API napi_remove_wrap is not being handled correctly

[shial4]

If a finalize callback was associated with the wrapping, it will no longer be called when the JavaScript object becomes garbage-collected.

this is the bit from the Node-API docs that is not being handled correctly, from napi_remove_wrap (https://nodejs.org/api/n-api.html#napi_remove_wrap)

[bghgary]

This is the case in JSC but we should check Chakra also. It should not be an issue for V8.