For an app to either send or receive content change notifications, require that they have some level of access to the underlying provider. Without these checks, a malicious app could sniff sensitive user data from the notifications of otherwise private providers. Test: builds, boots, PoC app now fails Bug: 32555637 Change-Id: If2dcd45cb0a9f1fb3b93e39fc7b8ae9c34c2fdef