Consider omitting `charset` for resource "Type"

Very minor, but Chrome doesn't show the `charset`s:

![](http://f.cl.ly/items/242C0A1s2H0I2p2Y0T3i/Screen%20Shot%202014-01-22%20at%205.33.50%20PM.png)

chromeHAR does:

![](http://f.cl.ly/items/3T1P25372k1i1o2c362r/Screen%20Shot%202014-01-22%20at%205.27.39%20PM.png)
