Remove SpeechRecognitionResultList (second try of E04)

Hi,

I just saw the discussion about reverting Errata 04 because Web IDL prevents sequence<T> type on attributes (because of copying whole values causes performance issue).

As of now, Web IDL has FrozenArray<T> which does not copy its values, and this is used for attributes on other web specifications e.g. Payment Request<http://www.w3.org/TR/payment-request/#dom-paymentaddress>.

I think we can try removing custom lists once again with FrozenArray<T>, what do you think?

Sincerely,
Kagami Sascha Rosylight