Merge "Revert "Stop active MediaProjection callbacks before registering new...

Merge "Revert "Stop active MediaProjection callbacks before registering new callbacks"" into udc-qpr-dev am: 97e3f828 am: 40821208

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24759513



Change-Id: I972dec461530b78556c83e84aecba38ff49495eb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>