Revert of Return Windows error code when create-process fails. (patchset #12 id:220001 of https://codereview.chromium.org/1247993002/ )

Reason for revert:
Broke compilation on Win 64 GN. Info at http://crbug.com/517326.

Original issue's description:
> Return Windows error code when create-process fails.
>
> COULD_NOT_CREATE_PROCESS makes up about 10% of the setup errors; include the actual DWORD result code returned by ::CreateProcess by placing all result information into the proper location of the Registry for reading by Omaha.
>
> BUG=
>
> Committed: https://crrev.com/135f5f669574bd07eaedaf6b57503984aeb13be8
> Cr-Commit-Position: refs/heads/master@{#341938}

TBR=grt@chromium.org,ganesh@chromium.org,robertshield@chromium.org,bcwhite@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1277833002

Cr-Commit-Position: refs/heads/master@{#342067}
11 files changed