Added Chrome Canary

Hey, I made a Canary icon… I tried to mimic your style/color palette.

I'm not sure if I recreated the icontainer properly, though.
![appicns_Chrome_Canary](https://f.cloud.github.com/assets/468029/303319/08020234-9622-11e2-9a7b-8b4f0c540b57.png)