Remove SpeechSynthesisVoiceList completely on 2014 Editor's Draft

Hello,

https://dvcs.w3.org/hg/speech-api/raw-file/tip/webspeechapi.html

This Editor’s Draft still has 3 occurrence of SpeechSynthesisVoiceList which is now undefined. Specifically, 5.2 IDL, 5.2.2 getVoices(), and 5.2.2.1 still refers it.

```webidl
sequence<SpeechSynthesisVoiceList> getVoices();
// should be sequence<SpeechSynthesisVoice>, someone just wrapped it by sequence<>
```

I will be happy to see this fixed :D

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