[automerger skipped] Delete unused getNamespace method am: 67b4512b07 am: a66c380985 -s ours am: 919d2ae6d7 -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: I00089615b859718856378fc0cbf80592abb124cb