Set system error code for Google Update.

TBR=noamsml
NOTRY=true

Review URL: https://codereview.chromium.org/183803007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254422 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254422