google-chrome ebuild prints this warning: CONFIG_USED_NS is not seen when it should be. ^ First, there is a confusing typo: that should read CONFIG_USER_NS ^ Second, at least the warning should specify that it's a kernel config option, not a google-chrome useflag.
I fixed the typo. As for the messaging, can you paste the entire output you see before the build starts? I thought linux-info.eclass output some sort of preamble.
*** This bug has been marked as a duplicate of bug 550020 ***