am 54419a4f: am 12221b6f: Merge "Fix monkey bug 2586534 java.util.ConcurrentModificationException Unlike the other audio focus and media button stack handling methods, abandonAudioFocus() and unregisterAudioFocusClient() were not synchronized around their focus stack.

Merge commit '54419a4fc908eab8408f39f3eae97c4315135d84' into kraken

* commit '54419a4fc908eab8408f39f3eae97c4315135d84':
  Fix monkey bug 2586534 java.util.ConcurrentModificationException