Building chromium with nss-3.14.1 installed resulted in this failure: ../../crypto/nss_util.cc:395:5: error: size of array ‘nss_version_check_failed’ is negative http://osdir.com/ml/chromium-reviews/2010-01/msg03901.html indicates this is a version check put in place on purpose. Updating to nss-3.15.2 resolved the issue. (I know 32.0.1700.2 and 3.15.2 work, no idea what other versions of chromium need the update or what is the new minimum dependency)
On trunk, it is looking for >= 3.14.3 at the moment. https://code.google.com/p/chromium/codesearch#chromium/src/crypto/nss_util.cc&q=NSS_VMAJOR&sq=package:chromium&type=cs&l=396 I'll check the stable version.
Thanks for the report! + 08 Nov 2013; Mike Gilbert <floppym@gentoo.org> chromium-30.0.1599.101.ebuild, + chromium-31.0.1650.39.ebuild, chromium-32.0.1700.2.ebuild: + Update nss dependency, bug 490756.