[automerger skipped] Delete unused getNamespace method am: 67b4512b07 am: 5e5a2aff8d am: 46e9fd117b -s ours

am skip reason: Change-Id I4f1a45f55e31d99903bf0cdac56c86a8d553a32c with SHA-1 67b4512b07 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/layoutlib/+/11544804

Change-Id: I40ba9b320e83f6c4747495cd40c1b6415d1a4d1a