Hello Guix!

Attached is a patch for Chromium, a popular web browser.

It requires the new ld wrapper from 'core-updates' and a very powerful
build machine (a quad-core Sandy Bridge Xeon uses 2-3 hours).

Note that I cannot guarantee timely delivery of security updates. Major
version upgrades are hugely painful, and almost always contain many
high-severity fixes. Should we mention that in the description?

Happy for any feedback.