Please update to Web IDL changes to optional dictionary defaulting

[bzbarsky]

Web IDL recently changed to require explicitly listing a default value for defaulted dictionaries instead of it just magically happening.

In practice what that means is that APIs like this:

 Constructor (BaseAudioContext context, optional AnalyserOptions options)

need to be written like this instead:

 Constructor (BaseAudioContext context, optional AnalyserOptions options = {})

(with the addition of = {} on the dictionary argument). This affects a bunch of the web audio APIs.

[padenot]

Taking this, this is just a bunch of manual fixes but probably rather straightforward.

[padenot]

Fixed by #1993, thanks for the heads up.