Merge "Makes this class abstract so that Tradefed's automatic search for runnable test classes doesn't get confused by this class." am: 4f8b47e5c2

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Settings/+/1515029

Change-Id: Ib92cfdb77164a7b24e65b2a028f963b606144096