[cros] Mark OOBE as complete after successful update.
[cros] Mark OOBE as complete after successful update.

BUG=chromium-os:7961
TEST=Manual

Review URL: http://codereview.chromium.org/4030004

git-svn-id: http://src.chromium.org/svn/trunk/src@63751 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: cf3d68f5d550da285823b0189fdb82b1fa089bcc
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser