am 62679112: Merge change I3c256cf3 into eclair-mr2

Merge commit '62679112a2ac98f6b73e9a5f6e92b3cb5728703c' into eclair-mr2-plus-aosp

* commit '62679112a2ac98f6b73e9a5f6e92b3cb5728703c':
  More SoundPool cleanup. Remove mSoundPoolRef and unused notify callback.