The change to the standard encoding/xml library was
https://go-review.googlesource.com/#/c/2660/
which landed on 2015-02-14. An additional change was
https://go-review.googlesource.com/#/c/5910/ which
landed on 2015-03-03.

Fixes #9978.

Change-Id: I4f798f153e4e13b13eadc10e44b21a4b118251d3
Reviewed-on: https://go-review.googlesource.com/5714Reviewed-by: Nigel Tao <nigeltao@golang.org>