GitLab

EntryStore and RankingsNode now have a new member that
verifies that whatever we read from disk is what we
wrote before.

BUG=100125
TEST=none
Review URL: http://codereview.chromium.org/8658001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112336 0039d316-1c4b-4281-b951-d872f2087c98