The tree download from chromium's googlesource repo produces non-constant tar.gz files. Each downloaded file differs in size. Sizes from 4 downloads in ~15 minutes today: 34084168, 34084232, 34084189, 34084139
should be all set now in the tree; thanks for the report! Commit message: Switch to Gentoo mirrors for stable SRC_URI http://sources.gentoo.org/sys-boot/vboot-utils/vboot-utils-42_p20150219.ebuild?r1=1.1&r2=1.2