Removed http://caniuse.com link

BUG=#136

Screenshot belows shows the missing "browser share %" next to "Working draft or equivalent" whereas it exists at http://www.chromestatus.com/features/5910974510923776

![image](https://cloud.githubusercontent.com/assets/634478/3541831/16a18e4e-0850-11e4-9af6-d9eeec7f767a.png)