am 50c6639a: Merge "Use StringPrintf."

* commit '50c6639a55b3208b64adc691b181a90e1e6de223':
  Use StringPrintf.
tree: 2f687d06c4e49afd95665b2a2229cd7651393422
  1. client/
  2. include/
  3. server/