browserSupportsSpeechRecognition returns true in Chromium browsers (e.g. Brave)

[JamesBrill]

As per https://github.com/JamesBrill/react-speech-recognition/issues/127, it appears that browserSupportsSpeechRecognition incorrectly indicates that speech recognition is supported in Chromium browsers like Brave. Google disables the speech recognition client in Chromium browsers, although it seems the speech recognition object is still present, hence the incorrect detection.

We should find a way to detect these browsers and return false from browserSupportsSpeechRecognition in those cases.