Move Cryptohome mount error code to system_api

BUG=chromium-os:16552
TEST=gmerge libcros

Change-Id: I14f756b802d37ba7c2cbccb2be3ad5ac9c2e5539
Reviewed-on: https://gerrit.chromium.org/gerrit/15481
Reviewed-by: Satoru Takabayashi <satorux@chromium.org>
Commit-Ready: Ryo Hashimoto <hashimoto@chromium.org>
Tested-by: Ryo Hashimoto <hashimoto@chromium.org>
1 file changed