Merge "Fix bug 2605504 Don't leak a metric ton of NotificationPlayer threads...

Merge "Fix bug 2605504 Don't leak a metric ton of NotificationPlayer threads The Looper on the thread created in order to be notified of the playback completion of notification sounds, was never stopped, causing the threads to stay around in wait state. The fix consists in quitting the Looper used for the previous sound when a new sound is started." into froyo