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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.

Review URL: https://chromiumcodereview.appspot.com/10830316

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151557 0039d316-1c4b-4281-b951-d872f2087c98