Remove LegacyVpnRunner am: 4fa38a5caa am: a323b451ec am: 46fcf7cd5a

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2727694

Change-Id: I9933063cf94aa5d4ac9dd8d2dfea6a3030000bc0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>