/usr/share/gtk-doc/html/webkitgtk-3.0 is in libwebkitgtk-3.0-dev 1.8.3-0ubuntu0.12.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/gtk-doc/html/../../doc/libwebkitgtk-3.0-dev/html
/usr/share/gtk-doc/html/../../doc/libwebkitgtk-3.0-dev/html