Update validation functions to use new error mechanisms. BUG=angle:520 Change-Id: I1c64af2e57cf2d89138bd23da2b07d5873742e4e Reviewed-on: https://chromium-review.googlesource.com/209880 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>