am ee513b60: Merge change 5444 into donut

Merge commit 'ee513b600efeb55040030a3dc9c8e7ef74b36149'

* commit 'ee513b600efeb55040030a3dc9c8e7ef74b36149':
  In the native layer for the TTS service, delete the data allocated for the callback after the signal for the end of the synthesis has been received.