Prefer Product_S/N when reading the serial number for enterprise enrollment.

Prefer Product_S/N when reading the serial number for enterprise enrollment.

This is effectively a partial revert of http://codereview.chromium.org/10542072/ for Lumpy devices, all other models remain unaffected because they don't have both the serial_number and Product_S/N keys in VPD.

Background: The serial_number VPD key (which would be the right source in an ideal world) returns a checksum-suffixed serial number on Lumpy devices that includes a trailing checksum character. That unfortunately causes trouble with the server side, which uses the non-suffixed serial number.

BUG=chromium:142681, chromium-os:31652
TEST=Check serial number reported on enterprise enrollment and used for auto-enrollment on Lumpy.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=151557

[Nico, 2012-08-14 20:48:44]

lgtm