Re: [heycam/webidl] Issues with callables, realms, and proxies (#847)

> Gecko currently does not use `GetFunctionRealm` for the callback case. It uses the actual global of the object, which may not match what `GetFunctionRealm` returns. Now that SpiderMonkey exposes a `GetFunctionRealm` API, we could change that.... Does Chrome use `GetFunctionRealm` there?

For the purposes of Web IDL, Chrome also uses the realm in which the object was created. For the purposes of determining entry realm for promise handlers, Chrome (actually V8) uses GetFunctionRealm with a fallback to the current realm.

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