This avoid us needing to capture an enum value for every possible
error code. Leave the existing enum values in for now.

BUG=477701

Change-Id: Iccaa4d9b732fe4d56432e17578421cba11bcf9ce
Reviewed-on: https://chromium-review.googlesource.com/271159Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>