/usr/share/vala/vapi/libebook-1.2.deps is in libebook1.2-dev 3.12.9~git20141128.5242b0-2+deb8u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3
libebook-contacts-1.2 libxml-2.0 gio-2.0