/usr/share/kde4/apps/kwebkitpart/kpartplugins/ is in konq-plugins 4:4.8.2-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kde4/apps/kwebkitpart/kpartplugins/akregator_konqfeedicon.desktop
/usr/share/kde4/apps/kwebkitpart/kpartplugins/akregator_konqfeedicon.rc
/usr/share/kde4/apps/kwebkitpart/kpartplugins/autorefresh.desktop
/usr/share/kde4/apps/kwebkitpart/kpartplugins/autorefresh.rc
/usr/share/kde4/apps/kwebkitpart/kpartplugins/plugin_babelfish.desktop
/usr/share/kde4/apps/kwebkitpart/kpartplugins/plugin_babelfish.rc
/usr/share/kde4/apps/kwebkitpart/kpartplugins/plugin_validators.desktop
/usr/share/kde4/apps/kwebkitpart/kpartplugins/plugin_validators.rc
/usr/share/kde4/apps/kwebkitpart/kpartplugins/uachangerplugin.desktop
/usr/share/kde4/apps/kwebkitpart/kpartplugins/uachangerplugin.rc