/usr/lib/x86_64-linux-gnu/libonline-accounts-client.so is in libonline-accounts-client-dev 0.3+14.04.20140328-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libonline-accounts-client.so.1.0.0