Gnome Games icons (request #790) + Chrome

![chrome-nckgahadagoaajjgafhacjanaoiihapd-default](https://cloud.githubusercontent.com/assets/5674757/3050032/4e8cfd14-e16f-11e3-9194-3fa8cf24303d.png)
![four-in-a-row](https://cloud.githubusercontent.com/assets/5674757/3050035/4e8e121c-e16f-11e3-9caa-91f674ef8fdf.png)
![gnome-chess](https://cloud.githubusercontent.com/assets/5674757/3050033/4e8dcd48-e16f-11e3-8f69-5c86c9565be8.png)
![gnome-klotski](https://cloud.githubusercontent.com/assets/5674757/3050034/4e8de44a-e16f-11e3-8cdd-b54d7dd4a7cd.png)
![gnome-nibbles](https://cloud.githubusercontent.com/assets/5674757/3053026/cc6f5190-e1a2-11e3-85b3-072b721a3c4d.png)
![gnome-robots](https://cloud.githubusercontent.com/assets/5674757/3050036/4e8e2acc-e16f-11e3-9fe3-4e203c56156b.png)
![gnome-tetravex](https://cloud.githubusercontent.com/assets/5674757/3050038/4e948bf6-e16f-11e3-83d2-9cba898f15ac.png)
![iagno](https://cloud.githubusercontent.com/assets/5674757/3050040/4e98fdbc-e16f-11e3-90c6-bfb2f8d24362.png)
![swell-foop](https://cloud.githubusercontent.com/assets/5674757/3050039/4e98a786-e16f-11e3-85b8-382161345ffa.png)
![tali](https://cloud.githubusercontent.com/assets/5674757/3050041/4e99085c-e16f-11e3-8255-8ce25207dceb.png)
![lightsoff](https://cloud.githubusercontent.com/assets/5674757/3053027/d1cd1dac-e1a2-11e3-99ff-b69566c83232.png)
![steam_icon_221260](https://cloud.githubusercontent.com/assets/5674757/3053029/d77c36e8-e1a2-11e3-8a65-9d88d5b5bcd0.png)