Merge "Remove legacy activity starter code" into udc-dev am: 2222c55f am:...

Merge "Remove legacy activity starter code" into udc-dev am: 2222c55f am: ec98fa0f am: 2a2f9e68

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22976334



Change-Id: Id7416906df0e1af7d2d8ed22eb76f5ae77dc065e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>