encoding/xml: remove SyntaxError.Byte
encoding/xml: remove SyntaxError.Byte

It is unused. It was introduced in the CL that added InputOffset.
I suspect it was an editing mistake.

LGTM=bradfitz
R=bradfitz
CC=golang-codereviews
https://codereview.appspot.com/182580043

bryanxu/go-zh,bryanxu/go-zh,webfd/go-zh,webfd/go-zh,bryanxu/go-zh,webfd/go-zh,d0f/go-zh,d0f/go-zh,d0f/go-zh,webfd/go-zh,d0f/go-zh,bryanxu/go-zh,bryanxu/go-zh,bryanxu/go-zh,d0f/go-zh,bryanxu/go-zh,webfd/go-zh,bryanxu/go-zh,d0f/go-zh,d0f/go-zh,webfd/go-zh,webfd/go-zh,d0f/go-zh,webfd/go-zh