Check for both new and old shflags during stateful update

BUG=chromium-os:21966
TEST=perform an update from an old build that doesn't have dev-util/shflags
installed to a current tot build

Change-Id: I999e49f658b99302b591450bf3c3788181408a91
Reviewed-on: http://gerrit.chromium.org/gerrit/10533
Reviewed-by: Doug Anderson <dianders@chromium.org>
Tested-by: Sonny Rao <sonnyrao@chromium.org>
1 file changed