Refresh manifest data.

Brings us from 8.3% missing to ~1.3%; wipe dead manifests (ebuilds
removed, but manifest left in place) additionally.

BUG=chromium-os24029
TEST=emerge -f any of the packages

Change-Id: Icd54a62ac80486ff6f1f9f3193d963accdcc1f65
Reviewed-on: https://gerrit.chromium.org/gerrit/17790
Tested-by: Brian Harring <ferringb@chromium.org>
Reviewed-by: David James <davidjames@chromium.org>
Commit-Ready: Brian Harring <ferringb@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
43 files changed