am 931b0a7a: Merge change 7811 into donut

Merge commit '931b0a7ac83e33a29e32b691ae8818a2f41b7808'

* commit '931b0a7ac83e33a29e32b691ae8818a2f41b7808':
  Remove obsolete playBuffer() method from the text-to-speech SynthProxy class.