am 8abc9e9b: Merge "Don\'t play a sound if a volume key press is canceled." into gingerbread

Merge commit '8abc9e9b9917760a63cc38a030e64f207aeef86d' into gingerbread-plus-aosp

* commit '8abc9e9b9917760a63cc38a030e64f207aeef86d':
  Don't play a sound if a volume key press is canceled.