Mathnerd314 faa82a676b gnome3 test: increase timeout
The gnome3 test has been failing recently ([1](http://hydra.nixos.org/build/26608126/nixlog/1/raw) [2](http://hydra.nixos.org/build/26605926/nixlog/1/raw)); this is due to exit code 124 which is [the command timing out](https://www.gnu.org/software/coreutils/manual/html_node/timeout-invocation.html).

This increases the timeout to 900, to align with the similar timeout in https://github.com/NixOS/nixpkgs/blob/master/nixos/lib/test-driver/Machine.pm#L222
2015-10-05 22:10:40 -06:00
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