The current behaviors of Blink about name look-up of Window’s members are not conforming to the spec, and they’re different from other browser’s behaviors. Let’s fix them.
Docs: https://docs.google.com/document/d/1t5nGcSNaABBBoPNCkDHheCifU1jBu7_AZmjhaXU-O8I/edit?usp=sharing