Deprecate unused cryptohome functions BUG=chromium-os:16552 TEST=gmerge libcros Change-Id: I42de2390f84ff2fc4abd8a74c050fd1223d8d434 Reviewed-on: https://gerrit.chromium.org/gerrit/15310 Commit-Ready: Ryo Hashimoto <[email protected]> Tested-by: Ryo Hashimoto <[email protected]> Reviewed-by: Satoru Takabayashi <[email protected]>