/usr/ is in unity-webapps-common 2.4.17+15.10.20150616-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/unity-webapps/
/usr/share/unity-webapps/userscripts/
/usr/share/unity-webapps/userscripts/unity-webapps-amazon/
/usr/share/unity-webapps/userscripts/unity-webapps-amazon/Amazon.user.js
/usr/share/unity-webapps/userscripts/unity-webapps-amazon/manifest.json
/usr/share/unity-webapps/userscripts/common/
/usr/share/unity-webapps/userscripts/common/validate.js
/usr/share/unity-webapps/userscripts/common/webapp.js
/usr/share/unity-webapps/userscripts/common/google-common.js
/usr/share/unity-webapps/userscripts/common/utils.js
/usr/share/session-migration/
/usr/share/session-migration/scripts/
/usr/share/session-migration/scripts/cleanup-local-webapps-in-launcher.py
/usr/share/session-migration/scripts/install-default-webapps-in-launcher.py
/usr/share/doc/
/usr/share/doc/unity-webapps-common/
/usr/share/doc/unity-webapps-common/changelog.Debian.gz
/usr/share/doc/unity-webapps-common/copyright
/usr/share/icons/
/usr/share/icons/unity-webapps-applications/
/usr/share/icons/unity-webapps-applications/index.theme
/usr/share/applications/
/usr/share/applications/ubuntu-amazon-default.desktop