base

Remove the default WebView text encoding resource entirely.

Having the default text encoding in config.xml makes it seem like
it's something that could be changed, but upon further inspection
we can't see any good reason for anyone to ever want to change it
from UTF-8.

BUG: 17634120
Change-Id: I10a09ab1d65590c29efb10222abfa08ca52b5c84