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

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



Change-Id: Iefbe2be94b6c4d76dcf630ce3e63ba2916145c59
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>