Fix double free of play policy in a race condition. am: 4b86f1dbae am: 02dcf3a9c0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/13472357

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I00787d876547200248e374b2faa7479a20757ef6