Merge "Clarify reasons for notification removal." into udc-dev am: ebf1af85...

Merge "Clarify reasons for notification removal." into udc-dev am: ebf1af85 am: b39bfaf3 am: eab556e0 am: 24f80538

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24211145



Change-Id: I2ca1902693bde1989ac540f5dd47ddba3386d661
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>