Add milestone to the OS versoin string.

BUG=None
TEST=Manually executed.

Change-Id: I00b8830276e2404d7ebc9d91c38681545faf0771
Reviewed-on: https://chromium-review.googlesource.com/457220
Commit-Ready: danny chan <dchan@chromium.org>
Tested-by: danny chan <dchan@chromium.org>
Reviewed-by: Tyler Reid <twreid@google.com>
1 file changed