Merge "Don't crash trying to unregister a receiver twice." into sc-dev am: 8905807a am: 2767de38 am: 8596695a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15274654

Change-Id: I9e86aecc64de365b5e978f9587c55097509a8a96