/usr/ is in libwebrtc-audio-processing-dev 0.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/webrtc_audio_processing/
/usr/include/webrtc_audio_processing/webrtc/
/usr/include/webrtc_audio_processing/webrtc/base/
/usr/include/webrtc_audio_processing/webrtc/base/arraysize.h
/usr/include/webrtc_audio_processing/webrtc/base/basictypes.h
/usr/include/webrtc_audio_processing/webrtc/base/checks.h
/usr/include/webrtc_audio_processing/webrtc/base/constructormagic.h
/usr/include/webrtc_audio_processing/webrtc/base/maybe.h
/usr/lib/x86_64-linux-gnu/libwebrtc_audio_processing.a
/usr/include/webrtc_audio_processing/webrtc/base/platform_file.h
/usr/include/webrtc_audio_processing/webrtc/common.h
/usr/include/webrtc_audio_processing/webrtc/common_types.h
/usr/include/webrtc_audio_processing/webrtc/modules/
/usr/include/webrtc_audio_processing/webrtc/modules/audio_processing/
/usr/include/webrtc_audio_processing/webrtc/modules/audio_processing/beamformer/
/usr/include/webrtc_audio_processing/webrtc/modules/audio_processing/beamformer/array_util.h
/usr/include/webrtc_audio_processing/webrtc/modules/audio_processing/include/
/usr/include/webrtc_audio_processing/webrtc/modules/audio_processing/include/audio_processing.h
/usr/include/webrtc_audio_processing/webrtc/modules/interface/
/usr/include/webrtc_audio_processing/webrtc/modules/interface/module_common_types.h
/usr/include/webrtc_audio_processing/webrtc/system_wrappers/
/usr/include/webrtc_audio_processing/webrtc/system_wrappers/include/
/usr/include/webrtc_audio_processing/webrtc/system_wrappers/include/trace.h
/usr/include/webrtc_audio_processing/webrtc/typedefs.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/webrtc-audio-processing.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libwebrtc-audio-processing-dev/
/usr/share/doc/libwebrtc-audio-processing-dev/NEWS.gz
/usr/share/doc/libwebrtc-audio-processing-dev/README
/usr/share/doc/libwebrtc-audio-processing-dev/copyright
/usr/lib/x86_64-linux-gnu/libwebrtc_audio_processing.so
/usr/share/doc/libwebrtc-audio-processing-dev/changelog.Debian.gz