autoupdate: Don't hardcode 9999

Also, use int comparison for version parts.

BUG=chromium:771236
TEST=None

Change-Id: I13bc7729f3a6b8a7f2fc3260a0f6b30a770217e0
Reviewed-on: https://chromium-review.googlesource.com/700815
Reviewed-by: Chris Sosa <sosa@chromium.org>
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Tested-by: Chris Sosa <sosa@chromium.org>
Tested-by: Paul Hobbs <phobbs@google.com>
2 files changed