Moved SecureBlob to libchromeos.

Previously this class was in the cryptohome module.

BUG=chromium-os:27681
TEST=Ran all unit tests and verified SecureBlob tests are running.

Change-Id: I8e41dc4b8c2d07129de90ff91de6554fd7fd6097
Reviewed-on: https://gerrit.chromium.org/gerrit/25121
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
Tested-by: Darren Krahn <dkrahn@chromium.org>
Commit-Ready: Darren Krahn <dkrahn@chromium.org>
4 files changed