Unprefixed Web Speech API incorrectly claimed to be supported by Chrome

[foolip]

https://web-confluence.appspot.com claims that APIs like SpeechRecognition and SpeechSynthesis are supported in Chrome, but these APIs are currently prefixed only, e.g. window.SpeechRecognition is undefined.

This is probably because webkitSpeechRecognition.name is "SpeechRecognition".

This might also affect some other webkit-prefixed APIs in Chrome and possibly Safari.