This test drives the new tools_webrtc/remove_extra_namespace.py tool. Bug: None Change-Id: I9b590aa1213e4cace2d64d555f4dafd893f03606 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/327021 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#41141}