another attempt at utf-8 uploads. the last attempt broke uploads of binary files like .png
another attempt at utf-8 uploads.
the last attempt broke uploads of binary files like .png

R=r
http://go/go-review/1026025
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go