Merge "Wait for ACTION_MEDIA_MOUNTED before removing started users." into tm-dev am: f171d009 am: 4c931f54 am: eddab6e6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18619746



Change-Id: I10ece799ae2aabc7811aec6cc069f6d4899171de
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>