Merge "Remove unused preview container" into udc-dev am: 21a31b40 am: b1f866c3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22545131



Change-Id: I83f97671e460a4bcea3a227a2afacf9c30e4a88e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>